Someone once told me the definition of an audiophile is someone that uses music to listen to his equipment. From experience, that's not altogether far from the truth.
If you really want to see how good your headphones (or whatever component) are, get a copy of Nilsson's Aerial Ballet (especially, the "Good Old Desk" track), Carly Simon's Boys in the Trees or Lady Gaga's (yes, Lady Gaga!) acoustic version of "Poker Face". All are lush, naturally ambient recordings of brilliant music.
But if you just want to smile, put your favourite LP/CD/mp3 into your player, seal your 'phones into a comfortable place and just listen.