There's an entire section of the site dedicated to learning songs.

go to Play Along section of Songs...

Jam tracks, play-a-longs and the old music minus one records are great tool for learning.

Music Minus One is a company that produces sheet music that comes with compact discs where the work is recorded without the soloist part (eg. Rachmaninoff's third piano concerto without piano). This can be used for practice. There is also a second version on the CD, where the tempo is 20% reduced. This company, in existence since 1950, is headed today by Irv Kratka, its founder, and a vigorous 82 year old fan of music.