Back in the 1960s, folk music received a series of jolts: Bob Dylan aspired to reproduce the unfettered outpourings of old-time American folk and blues by using electric instruments, while The Beatles wrote such instant folk songs as "Norwegian Wood" and "You've Got to Hide Your Love Away." From Seattle, Judy Collins started out as a pure folkie and later covered The Beatles and Sandy Denny. Collins' late-’60s and early-’70s albums are models of the kind of studio-rock that another folkie — Arlo Guthrie, the son of Woody Guthrie — perfected on such records as 1967's "Alice's Restaurant Massacree" and his 1969 masterpiece, Running Down the Road. Guthrie created a sly, tough style on that record's "Coming into Los Angeles," with guitar playing that was as striking as the lyrics. Both Collins and Guthrie have continued to record — folkies just get better as they go along.