just about any jazz music
Miles Davis and John Coltrane Live in Newport '66... that shit is solid gold
Miley Cyrus aka Hannah Montana and Jonas Brothers
Darkest Hour, Coheed and Cambria, and Baroness.
RAdiohead, or a band called Zero 7. Dunno if anyone has heard of them, but they do the best low-fi shit.
Also, the most chilled out song of all time, and possibly the greatest song of all time...
Teardrop - Massive Attack.