I'd say folk was maybe my 20th favourite - after experimental, free improv, prog, rock n' roll, psychedelic, hip-hop, drum & bass, medieval, Spanish renaissance, early classical, baroque, tertius auris, surf, doo-wop, free jazz, jazz, assorted ethnomusicology, 1920's English & American dance band music, exotica, Ennio Morricone's Spaghetti Western & Italian Gangster movie scores, etc. etc.