I had just listened to the Finding Nemo musical CD the day that we rode the subs for the first time so all the songs were in my head. After getting off the attraction, I realized that while I was still singing the songs, I didn't distinctly remember them in the attraction, but I easily could have not noticed as there's a lot going on. Upon riding it again, the closest they ever get is Dory's singing "Just keep swimming" and while it's pretty atonal, the lines are pretty much the same as the song- probably about the same as the film though too.
Does anyone know if that's Albert Brooks as Marlin? I know they used the woman who did Dory in the Musical, but Marlin really sounds like Albert Brooks to me.