I wonder if anyone knows, or recognised the sequencer that Jack Black uses at the very beginning of the movie?
I am going to take a fat guess on say none other than Noteworthy Composer
Seriously, I really would like to find out.
From what I saw in the movie, and they do zoom in on the interface (but unfortunately DVD resolution doesn't allow you to read the title bar), it looks very nice graphically and it seems to be a PC program not Mac's.
I Googled on it and looked at the screen shots for all major sequencers without much success so far.