"... twenty songs existing only as individual pieces of sheet music, never before released or recorded."
Sweet. People used to play their own music. Back in the 1930s, my mother bought sheet music. That was how the hit songs were purchased back then. I have a box of those old songs in my hall closet. But things are different today: Beck is inviting people to record these songs, and he's working with McSweeney's to make (some of) our versions of his songs available on line.