This one is weird:http://www.youtube.com/watch?v=-4ex1I4SFZsThis one I've always liked:http://youtu.be/v4KDilHRooQPost your mashups!

The second one was not bad; I would prefer not to listen to the first one.

http://www.youtube.com/watch?v=ALJy4NFBHqE

I've always liked this one, though the mixing is a bit weird:

 

http://www.youtube.com/watch?v=ugCXPLF2Ebs

 

And then there's this one, though it's technically not just a Sonic mashup:

 

http://www.youtube.com/watch?v=lqovVZ6zX3U

http://www.youtube.com/watch?v=ALJy4NFBHqE

I usually don't really like mashup songs,but I really like this one for some reason

I know these aren't Sonic related but they're classic mash-ups.

It's a lot so open at your own risk.

http://www.youtube.com/watch?v=ad_ayPWWCpchttp://www.youtube.com/watch?v=o2TO5atI4rUhttp://www.youtube.com/watch?v=FRiNCdqpwzchttp://www.youtube.com/watch?v=lAtP1j4dhgYhttp://www.youtube.com/watch?v=2LHrmXcIF1khttp://www.youtube.com/watch?v=LI4IxGK4vRI

http://www.youtube.com/watch?v=jzBI8bCIXrs