Ah, here's one that's important to me.
Jon "Bermuda" Schwartz, Jim West, and Steve Jay. If you don't know who they are, it might be better to say that they are Weird Al Yankovic's band mates.
I cannot stress how under-appreciated they are. And it happens for two reason. Weird Al has had commercial success for decades, but it's because people think he does funny parodies. Nobody really pays attention to the musical quality, and even though half of everything Weird Al does is original, his most frequently asked question is "why don't you do original work?"
On top of that, the credit that is given, is just given to Weird Al. How many people other than avid finds of the group know that band members? But they are very, very talented musicians. Their ability to write and play songs of almost any genre with the best of them is very impressive to me, and it's all the more impressive that they've done it so consistently for almost three decades.
Alas, they are confined to the small level of credit that a "comedy act" is allowed to have.