Bob DylanBob Dylan had to overcome a heroin habit in the early '60s, a previously unheard interview with the singer has revealed.

Dylan, who turns 70 on Tuesday, May 24, speaks candidly about becoming addicted to heroin whilst living in New York, BBC News reports.

The singer confesses to his journalist friend Robert Shelton, "I kicked a heroin habit in New York City. I got very, very strung out for a while, I mean really, very strung out. And I kicked the habit. I had about a $25-a-day habit and I kicked it."

Recorded in March 1966 on board Dylan's private plane bound for Denver, Colo., Shelton describes the interview as a "kaleidoscopic monologue" and the interviewee as "twisting restlessly" throughout the flight.