Also from the Beats newsletter

REM DO LENNON COVER FOR CHARITY
REM have recorded a cover of John Lennon track '#9 Dream' for compilation
charity album 'Instant Karma: The Campaign to Save Darfur'. The album is set
for release on 12 Jun in aid of Amnesty International, and will also feature
similar contributions from the likes of Green Day, Christina Aguilera, Snow
Patrol, Postal Service, Corinne Bailey Rae, Jack Johnson and Regina Spektor,
all of whom have recorded covers of Lennon tracks.

Not so sure about those other artists but presumably you;ll be able to get
it as a one off on iTunes.

Dave