This was to be the end of the line for Italian word-setting by Viennese composers: once the confident sentiments that belonged to the poet Metastasio's opera seria felt the chill and threatening wind of Enlightenment and Revolution, their time was up. Even we, for the most part, prefer to remember the German-speaking Beethoven, Schubert and Haydn. So it is good to be reminded of their responses to the Italian muse (usually as part of their craft-learning student work) in this particularly well-cast recital. Central Europe, in the person of Andras Schiff meets Italy, in Cecilia Bartoli, to delightful, often revelatory effect.

Even though Vladimir Ashkenazy is most often celebrated for his brilliantly virtuosic interpretations of Romantic repertoire, his skills in playing works of the Classical era are just as worthy, as proved by this 10-disc set from London of Wolfgang Amadeus Mozart's piano concertos. These performances span a period from 1966 to 1988, capturing a youthful and vigorous Ashkenazy playing and conducting the Philharmonia Orchestra and the English Chamber Orchestra from the keyboard, in approved Mozartian fashion. All of the keyboard concertos are here, including the official 27 concertos for piano and orchestra, the Concerto for two pianos in E flat major, K. 365, the Concerto for three pianos in F major, K. 242, as well as the two Rondos K. 382 and K. 386. Ashkenazy's elegant playing has been highly praised by critics and placed on a level with his esteemed contemporaries Murray Perahia, Daniel Barenboim, and Alfred Brendel, all past masters of Mozart's primary medium of expression.

"Greer is a highly accomplished player of the natural horn… I find Greer's playing very musicianly: unusually graceful in the phrasing of the quick movements, with gentle, thoughtful playing in K417 and some lovely smooth and clear lines in K495, while the slow movements are all beautifully done—the Romance of K447 refined and graceful, that of K495 often truly poetic with happy details of timing. And there is no shortage of wit in the finales, or of high spirits. Greer improvises his cadenzas: in the first movement of K495 he does, rightly I think, simply a longish flourish, with no reference to the themes of the movement." (Stanley Sadie, Gramophone Magazine)

Hilary Hahn and Natalie Zhu prove they are an excellent duo team in their first recording together, featuring four of Mozart's sonatas for violin and piano. All dating from 1778 and later, Mozart treats the two instruments more equitably in these sonatas than in his earlier ones. Hahn and Zhu are technically flawless together. They match each other as closely as two different instruments can to achieve a true duet sound. Just as Hahn "digs" into her strings for extra friction in the opening of the Sonata in E minor, K. 304, Zhu aims for the same tone quality with her touch. The two use longer note values, enhanced by vibrato and pedal, to give the music a pretty sound. It's probably more than a Classical era purist would like, but this is by no means a Romantic interpretation. Their slow movements, particularly those of K. 376 and K. 526, have beautifully rounded, cantabile phrases. The Allegro con spirito of K. 301 has bright accents and intense diminuendos and crescendos, demonstrating that this music isn't all elegance and delicacy.

Even though Marc-André Hamelin is world-renowned for his astonishing virtuosity and a massive repertoire of the most demanding piano works, including those of Scriabin, Godowsky, and Sorabji, he has startled many with his sudden turn toward the placid domain of Classical music. First came his critically acclaimed recordings of Franz Joseph Haydn's keyboard sonatas, which were surprise best-sellers for Hyperion, and here he offers a double-CD of the piano sonatas of Wolfgang Amadeus Mozart, with a handful of short pieces to round out the discs. Since Hamelin's fine reputation precedes him, suffice it to say that these are among the most meticulously played and wittily interpreted renditions of these pieces ever recorded.

When Richard Maunder's editions get together with Christopher Hogwood and co, you know instantly that the result will be spot on. The sound of the boy treble line (singing alto as well) is earthy yet in tune, and well complemented by the strong lower parts. The orchestra is supportive yet unobtrusive. The dynamics and phrasing are all well chosen and executed. The choice of soloists is inspired, especially Arleen Auger - such a beautiful voice. It is just a pity that there is not more on the disc - some have argued in the 'Dona ut Kyrie' tradition that an Agnus Dei could be tacked on at the end using the music of the Kyrie. An excellent recording.

Maria João Pires “shapes and colours every phrase, and with immaculate taste, and she makes sure the phrases end as eloquently as they begin,” wrote Gramophone in 1974. “She conveys not just the details but the relevance of every note to the whole … Best of all, she communicates everything she has discovered about the music, and it is worth having.” This Portuguese pupil of Wilhelm Kempff, Pires was one of the artists who defined the Erato label in the 1970s and 1980s. This 5-CD box gathers together the recordings she made over the period from 1976 to 1985 and it reflects the consistent focus of her repertoire, with its special emphasis on Austro-German composers of the Classical and early-Romantic periods. Embracing solo works, piano duets and concertos, it contains works by Mozart, Schumann, Beethoven, but also by Bach and Chopin.

Between 1961 and 1986, Herbert von Karajan made three recordings of the Mozart Requiem for Deutsche Grammophon, with little change in his conception of the piece over the years. This recording, from 1975, is, on balance, the best of them. The approach is Romantic, broad, and sustained, marked by a thoroughly homogenized blend of chorus and orchestra, a remarkable richness of tone, striking power, and an almost marmoreal polish. Karajan viewed the Requiem as idealized church music rather than a confessional statement awash in operatic expressiveness. In this account, the orchestra is paramount, followed in importance by the chorus, then the soloists. Not surprisingly, the singing of the solo quartet sounds somewhat reined-in, especially considering these singers' pedigrees. By contrast, the Vienna Singverein, always Karajan's favorite chorus, sings with a huge dynamic range and great intensity, though with an emotional detachment nonetheless. Perfection, if not passion or poignancy, is the watchword. The Berlin orchestra plays majestically, and the sound is pleasingly vivid.

Of all the reconstructions prompted by the 1991 Mozart jamboree, Philip Wilby’s recreation of the Violin and Piano Concerto of 1778 was the most worthwhile. Wilby skilfully completed the 120-bar fragment of the first movement and took the slow movement and finale from the unusually brilliant, ‘public’ D major Violin Sonata, K306. There are problems – not least of dates – with Wilby’s thesis that the Sonata is the ‘last resting-place’ of the projected double concerto. But the three movements certainly make a satisfying entity. Midori and Eschenbach give an immensely polished reading, phrasing with unfailing subtlety and sophistication.

It's a recording that just a few years ago would have been mainstream: a "name" pianist (albeit one much less well known in the U.S. than elsehwere), who has been playing Mozart's piano concertos since childhood, joins forces with a name conductor with whom she has frequently collaborated, leading a modern-instrument orchestra of some 70 players, with the results released on a major international-conglomerate label. Now it's distinctly unusual. But lo, there's value in the old ways. Portuguese-Brazilian pianist Maria-João Pires is a lifelong Mozart specialist, but she still has new things to say in two of Mozart's most popular piano concertos. You can chalk it up to her Buddhist outlook if you like: her readings of the Piano Concerto No. 27 in B flat major, K. 595, and Piano Concerto No. 20 in D minor, K. 466, might be described as detached without being lifeless. Her approach is most startling in the Piano Concerto No. 20, where her no-drama shaping of the material runs sharply counter to type. Sample the piano's entrance in the first movement, where it offers a twisting, tense elaboration of the main theme that is far removed from its source material. Generally pianists use this to raise the tension level, but Pires lets the unusually shaped, chromatic line speak for itself with fine effect.

As the mysterious opening bars of the Kyrie gradually emerge into the light, we know that this recording of Mozart’s glorious Great Mass in C minor is a special one: the tempi perfect, the unfolding drama of the choral writing so carefully judged, and, above it all, the crystalline beauty of soloist Carolyn Sampson’s soprano, floating like a ministering angel. Masaaki Suzuki’s meticulous attention to detail, so rewarding in his remarkable Bach recordings, shines throughout this disc, the playing alert, the choir responsive, the soloists thrilling. And there is the bonus of an exhilarating Exsultate, Jubilate with Sampson on top form.

The reissue of keyboardist Claude Bolling's recordings of the 1960s may prompt a positive reevaluation of his contributions. Bolling has been known, at least outside France, mostly for the flute-and-piano works he composed for Jean-Pierre Rampal; his recordings with Rampal hit a certain popular groove and stuck with the formula. They were undeniably appealing in a simple way, but they became fatally overexposed. Bolling's earlier recordings reveal more imagination in his treatment of the relationship between jazz and classical music. Take for example this 1965 album, recorded in Paris. It's one of the few successful jazz treatments of Mozart, who is notoriously resistant to jazz treatment. The difficulty comes as a result of Mozart's reliance on harmonic rhythm, or the speed of the rate of change of the harmonies in the music. This feature seems impossible to capture in jazz, which heavily relies on regular chord changes, but Bolling's solutions here, making use of a classic jazz sextet, are brilliantly imaginative.