Worth it to collect a few (paper) books for camp songs, american classics ( musicals, etc) and Beatles tunes.
I've found that most "folk" music is readily playable by a competent hobbyist musician. It's certainly easier then concert band or orchestral music. By folk, I mean American folk and campfire, Celtic jigs and reels, sailors shanties and hornpipes , military marching songs, work songs, blues, etc.