Gimmell Records is renowned for high quality recordings, though of a limited range of music.
For a limited time the Kyrie of a Josqin Mass is available for free download in a number of formats and resolutions.
I have not before seen iTunes friendly downloads available from Gimell. Perhaps this development is tied to the launch of the iCloud.
Even if this sort of music is not your normal choice I recommend you grab the free track for a listen.