I found that I had 20 songs in my iTunes library that were 3m46s. I picked 6 of them, laid them on top of each other and played with the levels.

James - Avalanche
The Flaming Lips - This Here Giraffe
The Innocence Mission - Snow
Kula Shaker - Tattva
David Byrne - Loco de Amor
The Choir of the Orthodox Church of Turku, Finland - Pavel Tschnokov's "O Earnest Helper (Op 43 No 6)

Weee!