14 behind-the-scenes photos showing Bob Dylan joking around with his famous friends backstage

In the summer of 1975, the late photographer Ken Regan received a phone call at 3 a.m. from music promoter Barry Imhoff asking him to photograph the entire first leg of Bob Dylan's "Rolling Thunder Revue", a multi-city tour.

Regan, jolted awake and confused, couldn't believe what he was hearing. All of a sudden, Dylan was on the phone line, confirming that he wanted Regan to be the one photographer documenting the entire experience.

By that afternoon, he was at Studio Instrument Rentals in Manhattan, attending a Dylan rehearsal, and an agreement was met.

This March, Ormond Yard Press is releasing a limited edition of "ROLLING THUNDER", featuring the photographs, some of which have never been published, that Regan took on tour.

Ahead, see 14 images of Dylan goofing off both on and off stage with stars like Patti Smith, Bruce Springsteen, Bette Midler, and Muhammad Ali.