Just saw this... surprised it wasn't on here already. They're not metal but pretty cool.
Minnesota Sex Junkies Website
"Freebies Rule! “Rock Band 2” tracks submitted to Rock Band Network available for FREE download HERE.
Five tracks from “MSJ” are available as a free download in celebration of our involvement with the upcoming Rock Band Network, a selection of downloadable tracks for Rock Band 2.
Feel free to share these MP3s with anyone who may like them. Copy them. Distribute them. Give them away. Etc etc.... just spread it around.
Enjoy! And don't forget to look for us on the Rock Band Network!"