Kenny Rankin appeared on "The Tonight Show with Johnny Carson" in excess of twenty times. Johnny even wrote the liner notes for Kenny's 1967 debut album "Mind Dusters" which features the original recording of "Peaceful" (Rankin). He performed "Blackbird" at the request of Paul McCartney when he and John Lennon were inducted into the Songwriters Hall of Fame. Kenny also sang at the 2008 memorial service for his close friend George Carlin.
Helen Reddy hit the top ten with her cover in 1973. It's from her album "I Am Woman".