Name of Song and Artist for the love scene between Domino and Choco in the Desert

I am desperately looking for the artist and the title of the song for the love scene between Domino and Choco in the desert. The song also plays out over the end credits after an initial song comes on. I have googled and yahooed until I am blue in the face. I IMD'B it but while it lists the songs you have no idea where they are played in relation to the movie. I don't know if it's La Marcela or is is Heitor Pereira or Harry Gregson; these are all results I get from amazon. Does this song appear on a CD I can purchase? Please help! I am obsessive compulsive and I am obsessed with this!

Last week I figured out that the band Hot Tears featured in Shopgirl were really Sun Kil Moon. I did it all by myself, like a big girl but this one is killing me.

Someone send me a line please!
Thanks!
Angela

azure_0505, December 21, 2006; 5:30 AM