Genre?
Shape of my Heart by Sting
Opeth - Patterns in the Ivy (I & II)Opeth - Still Day Beneath the Sun
Carry On - Crosby Stills Nash and YoungShould be pretty simple, just a few major chords with hammer-ons.
Opeth are cool. I've seen them live as well, they're great! Though if he's looking for music to sing/play, he's probably going to have a hard time with Opeth :P