Bobby Hart, a key part of the the Monkees’ multimedia empire who teamed with Tommy Boyce on such hits as “Last Train to Clarksville” and “I’m Not Your Steppin’ Stone,” has died. He was 86.

Hart died at his home in Los Angeles, according to his friend and co-author Glenn Ballantyne. He had been in poor health since breaking his hip last year.

Boyce and Hart were a prolific and successful team in the mid-1960s, especially for the Monkees, the made-for-television group promoted by Don Kirshner. They wrote the Monkees’ theme song, with its opening shot, “Here we come, walkin’ down the street,” and its enduring chant, “Hey, hey, we’re the Monkees,” and their first No. 1 hit, “Last Train to Clarksville.” The Monkees’ eponymous, million-selling debut album included six songs from Boyce and Hart

See Full Page