Ambient/space music artist Michael Meara has a large collection of free MP3 downloads available at his site, Sonic Journey.
“Most pieces are either in the vein of cold void space ambience or the warmer currents of classical ambient drift. The artists’ ultimate aim is to aid in the navigation of various sleep-states by providing the appropriate soundtrack to deep inner journeying.”
The downloads are full mp3 versions of selected tracks encoded at either 128 or 192 kbps.
You can preview the music of Micheal Meara below.