All bosses from Super Meat Boy including their related cutscenes. I also did the light and dark world version of Dr. Fetus. Since both versions have the same cutscenes I didn't double up.
Timestamps:
Lil' Slugger 0:03
C.H.A.D. 1:56
Brownie 4:44
Little Horn 7:00
Larries Lament 9:41
Dr. Fetus (Light World) 11:16
Dr. Fetus (Dark World) 13:37