Unitron
"Get in line, free your mind"
If you want to find maybe the largest amount of great bands lost in time, just look into the funk metal genre. It had a very brief amount of popularity in the late 80's and early 90's, but unfortunately once it went out of style, so did most of bands with it. A handful kept a legacy (Living Colour, Fishbone) or changed their sound (Red Hot Chili Peppers, Faith No More), but most sadly remain forgotten.
Atom Seed is one of the many funk metal bands that only managed to put out one album, but also like many of these bands, this is an album that sounds like a passionate band unrestricted. There's the thrash-funk of the title track and Bitchin', moodier songs like Shot Down and Better Day, several straight up funk metal songs, and the monumental heavy metal of Castles in the Sky as the best song on the album. Hearing how fantastic this song is makes it that much more sad that Atom Seed only released an EP after this and disbanded shortly after that.
Maybe someday funk metal will finally get its due appreciation and even make a comeback, but until then, this is one of funk metal's many underrated classics. All we want are castles in the sky.