Lucky Number Slevin Soundtrack

When you enter in the official site of the movie there's a song being played, but I couldn't understand the worlds and so I wasn't able to find the title.Anyone knows it?

'Kansas City Shuffle' is the name of the song.

Does that answer the question?

I really like this soundtrack, but cannot find the musical cue used in the last scene between Slevin and Goodkat when Goodkat has the flashback to when he couldn't kill Slevin and tells him "I'd have understood." I have listened to Wrapup part 3 and FUB, but I do not think that exact music is used in either of those songs. Can anyone help me out with this? Thanks.