John Lennon would have turned 67 in 2007. If alive, he could well be at the forefront of bringing peace to Darfur, where more than half a million have died from violence and disease during four years of rebel discord. So to create awareness of the ongoing conflict, Amnesty International (with permission from Yoko Ono) has mined Lennon's solo work and rounded up nearly two dozen current artists to reinterpret the music, which spans the ex-Beatle's entire post-band catalog (plus a pair from while the Fab Four were still in business). As with any attempt to cover Beatles-related music, results are hit and miss, with kudos going to Snow Patrol and the Postal Service for capturing the starkness of "Isolation" and "Grow Old with Me," respectively, Mexican rock band Jaguares for uncovering the fear and fury in "Gimme Some Truth," and (surprise!) Christina Aguilera for nailing the complex composition and mood of "Mother." Other highlights include Jackson Browne's piano-led "Oh My Love," Green Day's louder straight take on "Working Class Hero," and the Black Eyed Peas turning "Power to the People" into a gospelly protest. Will resurrecting 30-to-40-year-old messages of peace and love be enough to help end the brutalities in Darfur? That remains to be seen. But selecting John Lennon as the author of those messages will make people listen and, with this collection, may keep them listening.

Passion Jaroussky marks 20 years since Philippe Jaroussky made his professional debut and commenced his rapid ascent to stardom. As the French countertenor says, “Even after all these years, my passion for music is undimmed.” Ranging musically from the 16th to the 21st century, the triple album comprises both new recordings and highlights from recent albums, and it also showcases Jaroussky’s collaborations with a host of major singers – from the worlds of both classical music and pop – instrumentalists, conductors and orchestras.

After the harrowing Plastic Ono Band, John Lennon returned to calmer, more conventional territory with Imagine. While the album had a softer surface, it was only marginally less confessional than its predecessor. Underneath the sweet strings of "Jealous Guy" lies a broken and scared man, the jaunty "Crippled Inside" is a mocking assault at an acquaintance, and "Imagine" is a paean for peace in a world with no gods, possessions, or classes, where everyone is equal…