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Hi there chipmusic.org
There are archives for every console chiptunes - NES, SNES, SMD,,,
But there is no any good one for Sega Master System and Game Gear
There is messy little one on Zophar domain, with Genesis MKs in it
http://www.zophar.net/music/vgm.html
Maybe there is a big one, or we can start The One?!
wow,,, didn't Google enough! 
Before opening the link, googled again - yep, here it is!
..and, dammit, I even saw this site before!
Thanx Shiru!
SMS Power is THE PLACE to know anything about the SMS. From music to programming, is a great website.
There is no MortalKombats' music 
that's a pity...
I wanted to hear the tracks I remember till the end of times (from Genesis) in 2 channels!