Most of my listening is to classical music, and I have far too many excellent sounding recordings to be able to single out three. What I would suggest you do, to the extent that you are interested in classical recordings, is to focus on labels that are known to produce consistently good sound, and choose particular recordings based on the music and, to the extent possible, the performances.
I would recommend the following labels as consistently providing excellent sounding recordings (although unfortunately some of them no longer exist):
Accent
Astree
Audiofon
Chesky
Dorian
Harmonia Mundi France
Hyperion
Lyrinx
M&K Realtime
Mercury Living Presence re-issues
North Star
Pierre Verany
Proprius
Reference Recordings
Sheffield Labs
Syrinx
Telarc (many are excellent; some will be disappointing)
Valois
Wilson Audio
Among non-classical recordings, I would single out "The Sheffield Track Record." I have it on the original direct-to-disk LP, but it is currently available on cd together with "The Sheffield Drum Record" (which I haven't heard). One of the ultimate demo disks.
Regards,
-- Al