Near the end of February, a collective of local musicians will gather together at the Somerville Theatre near Boston, MA, to perform Beck’s new album, Song Reader. They won’t be covering his songs so much as performing them into existence. You can’t listen to Song Reader on your iPod or stereo. The only form it takes is in a beautiful hardcover book published by Mcsweeney’s, complete with original art, essays by Jody Rosen and Mr. Hansen himself, and the songs, rendered as sheet music. In order to hear the album, you have to play it yourself. In an industry beleagured…