Slaying Jester (heavy)
All they have is a demo and nothing showed up on google for this (yet M-A denied a band I submitted because they only had an EP which was on youtube and bandcamp.. aside the point)
Next...
Humanicide (thrash/crossover)
There's a cassette on discogs for this band, but no videos.
Scamp (groove/thrash)
Listening to Silent Inferno. Surprisingly not bad. Lyrics a bit weak, but I've heard worse. Well the breakdown section could use some work. The vocals and riffs are pretty tight overall. I'd listen to more...
Operation Winter Mist (black)
Listening to 'Arctic Wolves'. Liking it ok. It has the same blah non-appeal of a lot of black metal for me. But it's serviceable for black metal. The riffs in this middle section are almost radio friendly metal, weird contrast.
Last one for now:
Error X (grindcore)
Listening to Error X from their album Error X. This video was clearly made in someone's garage. Not exactly what I'd call grindcore either. There's no vocalist. Yeah this just sucks.