Caul is the project of American musician Brett Smith, and he has released a fair amount of his back catalogue for free at the
Reliquary. There are over 50 tracks from five full albums, along with a few other individual tracks. All the tracks are at least 192kbps mp3s, so the quality is good, although I have found the track transitions in my player at least to be a bit glitchy. The albums are single zipped files, so the more bandwidth you have, the better.
The music ranges from dark ambient of the album 'Crucible', through to more neoclassical-influenced 'Light From Many Lamps', and it is all very good indeed - particularly the aforementioned 'Crucible'.