Hearing The Watersons' "Frost & Fire" for the first time, when I was 13 or 14.

June Tabor's solo on "The Transports."

Non-folky stuff would include Allegri's "Miserere," the old spiritual, "Where you there when they crucified my Lord?," and Mahler's 5th symphony. On a more discordant note, there's the Sonic Youth album "EVOL," which sounded so much like the music in my head it was uncanny. Also, Johnny Cash "Live at Folsom Prison."

This list is getting too long....