Update!
I took a gameplay video from Ratchet & Clank: All 4 One, and rescored it! And added SFX!
Okay, so, the first three seconds are just filler, the good stuff happens when the camera pans away and the big guy is introduced, and after that it's just more filler music for another 2 seconds.
This is actually how someone would score music for a game like this. The main level music would fade out as soon as that cutscene (0:03) starts, and the cutscene's music would fade in, and then seemlessly transtiion to the "boss music" (the last few seconds of music at the end).
So, in actuality, it's three pieces of music that crossfade with one another.
1. Main level music.
2. Cutscene music.
3. Boss battle music.
I only had a short video to work with, though, so I really only concentrated on part 2, since parts 1 and 3 were so short in the video.
Anyway, enjoy!