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Barclay James Harvest - Hymn

Wiki:

Hymn is the first track on "Gone To Earth", an album by the English rock group Barclay James Harvest released in 1977. Written by band-member and guitarist John Lees, the song is sometimes misinterpreted as a Christmas song but is actually a song against the dangers of drug use (and dedicated to musicians like Jimi Hendrix, Paul Kossoff and Janis Joplin).