Blank.

I'm not an expert on the replacements, so my word is poop when it comes to them. That said, I can't think of anything of note they did. If I'm wrong please correct me. Like I said, I'm by no means an expert.

As for the Pixies being the most influential, i could agree with that. I might say the cure, but their music in my opinion hasn't stood the test of time as well. They don't seem to still be influencing musicians the way the pixies do.