help!

this would be really ridiculous. but i recently saw this trailer of the old version of thomas crown affair on youtube.

i loved the song but didn't know what the title is and who's singing.

please!! somebody just tell me the name!!! help really needed here!

i'm dying to know the title!!

the site to the trailer:

http://www.youtube.com/watch?v=_b_jZ_2g9lg

thank you so mucH!!!