Mozart really liked the number 5. Aside from the group of six string quartets dedicated to Haydn, just about all of his greatest chamber works are quintets, and some of them are very unusual too. This particular set contains three magnificent late string quintets, the ever popular Clarinet Quintet, and weirdly wonderful Adagio and Rondo for Glass Harmonica, Flute, Oboe, Viola and Cello. A glass harmonica, by the way, is a set of water-filled glasses that you set spinning and play with moistened fingertips. It was invented (or at least perfected) by Benjamin Franklin, and was wildly popular in Mozart's day, particularly among amateur female performers. An excellent collection in every respect.

This series of performances dates from between 1966 (when the six quartets Nos. 14-19 dedicated to Haydn were recorded) to 1973 and was rightly saluted on its completion as a fine achievement. The playing of the Quartetto Italiano has a freshness, range and subtlety that vividly realizes the music in all its variety, while technical problems seem to have been solved so that the music-making can be both spontaneous-sounding and thoughtful throughout.

This venerable recording by the Italian Quartet from 1965 was, for many years, the standard reference copy of both works either individually or as a coupling. One of the considerable virtues of this group of players was that they could always be relied upon to play in tune and to play with musicianship. The competition was not so strong as it is today as many of the alternative groups simply could not deliver accuracy in tuning (or even worse, the notes). This was rarely commented upon in review magazines at the time, a source of complete bemusement for me, but as one who was expected to play in tune I found listening to string chamber music almost beyond bearing for much of the time - except for this group.

…it's one of the quartet's last recordings, but the legendary luminosity of sound is still there, as is the beautiful precision, perfectly complemented by Pollini's clarity and control of touch. But it's by no means a cold, clinical performance - the first movement is powerfully dramatic, the Andante expansively lyrical, and the start of the Scherzo has never sounded darker or more mysterious.

Historical recordings: The ensemble's confidently-chosen name made it clear from the outset that the Quartetto Italiano saw itself not simply as an Italian string quartet among many, but as the authoritative one. The ensemble was soon recognized as a pioneer of Italian chamber music culture following the Second World War. Through their tireless obsession with detail, in-depth exploration of the works' musical expression, and the remarkable homogeneity of their quartet sound, the Quartetto Italiano conquered a firm place in the top league of leading string quartets over the first two decades of their career.

Historical recordings: The ensemble's confidently-chosen name made it clear from the outset that the Quartetto Italiano saw itself not simply as an Italian string quartet among many, but as the authoritative one. The ensemble was soon recognized as a pioneer of Italian chamber music culture following the Second World War. Through their tireless obsession with detail, in-depth exploration of the works' musical expression, and the remarkable homogeneity of their quartet sound, the Quartetto Italiano conquered a firm place in the top league of leading string quartets over the first two decades of their career.

Grumiaux’s elevated intellectual profile is put to exalted use in the Debussy Sonata. He has a quicksilver response to the music’s twists and turns and an alertness to the necessary momentum in the first movement. He is thus forward moving but flexible with a fast vibrato and multi variegated tonal response at once apposite and unostentatious. Listen at 2.15 to about as extravagant a portamento as he ever made on disc. If you want to hear fluent and incisive duo playing listen to Grumiaux and Hajdu in the Intermède where understanding of motivic details and larger structure reigns supreme.