La Tunica Stracciata has put up a podcast with the sung propers (Classical Rite) for next Sunday's (Mass 9th after Pentecost). Presumably this is updated each week.
There is also a link to a pdf of the relevant pages of the Graduale Romanum which can be printed off.
I think that the mp3s of the chants together with the pages from the Graduale would be very helpful for a choir starting out on singing the propers.
Many thanks to Mike for sending me the links.