Joni Mitchell song that gave Matthews Southern Comfort a number one single in 1970 (9)

I believe the answer is:

woodstock

(Other definitions for woodstock that I've seen before include "1969 US rock festival" , "Log pile" , "Snoopy's confidant" , "Famous US rock festival" , "Pivotal American music festival in 1969" .)

I've seen this clue in The Independent.

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