Here is a list of My favorite Underground Musicians
Stemage : a great progressive Rock/Metal Band. I liked them since 2nd grade, when they did Metroid Metal.
Ross: Most probably my favorite Musician of all time, A progressive Grunge solo artist. Enough Said, he's terrific.
ChucksNation: A somewhat Punk band, that I haven't listened to in a while, I highly recommend them to people that like Pennywise or NOFX.
Fishenelmar: A great cover artist. He does mostly Nirvana, and he has a very similiar voice to Kurt Cobain, accept he has an awesome accent, which adds to the music.
The Action Plan A Pop/Punk/Ska band from Wales. I recommend them to you if you like blink-182.
RedStripedd
The only one I've heard of is Ross. And Blink-182 suck. They are untalented even by punk standards.
ChickenGod
I agree, I only like them a little, they are untalented, but some of there vocal rhythms are fairly catchy.