Norma Waterson and Eliza Carthy on the radio the other day (Woman's Hour) talked about traditional music being affected/enriched/informed by other stuff going on at the same time, so Norma in the 60s couldn't help but be influenced and affected in some way by The Beatles and Eliza's generation by Prince and/or the Arctic Monkeys. (And indeed vice versa, with the likes of Led Zeppelin and who knows who else being influenced by folk).