Dealing with .AST files (Mario Galaxy, Bowser Theme, Shell Spinning)

I’m trying to create a clean copy of Bowser’s Battle Theme from Super Mario Galaxy 1. I’m talking about the one that plays while battling him while his shell spins:

http://www.youtube.com/watch?v=iVp2HhktW94

I tried extracting the .AST file from my copy of Galaxy. After some trial and error, I discovered this file contained Bowser’s music (SMG_boss07_multi.ast). I used astmulti00 to split the theme and gave me the Normal and Chorus theme. Neither contained that flute instrument that plays while Bowser’s shell spins.

What am I doing wrong? Where can I find this file on the disc? I tried the other .ast file with no luck. I also tried the .aw files but after reading the results of thanghn90 from HCS Forum – Super Mario Galaxy and wwdumpsnd? (http://hcs64.com/mboard/forum.php?showthread=22046), I kinda became discouraged.