Tetrafusion started off as an instrumental band and recorded one album ("Absolute Zero") that way. On the follow-up, they incorporated vocals into their band sound, giving the music a lot more focus (IMO at least). Their new release is an EP called "Horizons" and it was entirely funded by the fans through various pre-order packages. As a result, the band have decided to offer the music as a free download. Those who don't mind paying can choose their own price or just order the CD version (for $7).
The music is progressive rock/metal, but before I waste my time on comparisons and descriptions, just hear it yourself:
Tetrafusion
Obviously I like it quite a bit.
