This sounds a lot like
this but with a slightly slower tempo.
I can hear Count Bleck's theme in the boss theme of Mario & Luigi: Paper Jam.
I can also hear Super Paper Mario's Flipside theme in the credits theme of Paper Mario: Sticker Star.
Harvest Hazards from Tropical Freeze kinda sounds a little bit like
That's All by Genesis sometimes, doesn't it?
(Boy am I glad the YouTube comments were there to tell me which Genesis song specifically - I so rarely listen to them but as I was listening to Harvest Hazards while driving it was bugging me how easily I was able to imagine Phil Collins singing along with it and I
had to know why.)
Wily Castle 1 from the original Mega Man and the boss theme from Kirby's Adventure sound pretty similar.
The intros of these two songs.
Oh hey this is a thing?
Dynamite Dux - Boss theme
Vs.
Street Fighter EX3 - Darun Mister (skip to 0:44)
Also speaking of Street Fighter.
Superman (Sega Genesis) Stage 1
Vs.
Marvel Super Heroes Vs. Street Fighter - Chun Li
Honorable mentions:
Beware The Forest Mushrooms Vs. The Wonderland world in Kingdom Hearts
Mute City Vs. Captain America's theme from Marvel Vs. Capcom
Sorry for the semi bump, but since I noticed this one, I have issues unhearing it.
This one is so freaking obvious, that I don't even need to tell you (I hope)
If you don't understand, let SMW help you.
Not gonna embed more than one vid on a post