If the music guy in on a Mac you can include the M100 Codecs installer.
The Intel-friendly one is here:
http://www.borisfx.com/login/m100_reg_form.php?action=m100CodecsIntel
The PPC flavor is here:
http://www.borisfx.com/login/m100_reg_form.php?action=m100CodecsPowerPC
If that doesn't help, try exporting to some other codec that the music guy can play on his system.
File > Export > Other > QuickTime then click Options, there's all kinds of choices in there. Also remember that they may not need the file to be full frame size, going with 480x360 can save a lot in file size.
