Today marks the 31st anniversary of superstar trio's Number One single and biggest hit, "To Know Him Is to Love Him"
New 40th anniversary reissue of singer's 'Simple Dreams' includes previously unreleased live recordings
Swampy segment from a 1980 episode of the musical variety series finds singer backed by a frog chorus on pop-country classic
Performance was part of an all-star salute to Ronstadt in Los Angeles
In celebration of today's release of their new 'Complete Trio Collection' album, watch the legendary threesome perform for Johnny Carson
A cappella take on "Calling My Children Home" appears on the upcoming 'Trio' boxed set
Written by Parton, this alternate version of the singers' 'Trio' album hit appears on the upcoming 'Complete Trio Collection'
Pop icon covers Hank Williams' "Lovesick Blues" in this 1969 clip from Hugh Hefner's variety series
'The Complete Trio Collection' includes two classic albums, plus 20 previously unreleased tracks
Two trade lines on the haunting folk ballad, 'I Never Will Marry,' in this 1969 clip from 'The Johnny Cash Show'
Country chanteuse joins Linda Ronstadt and Emmylou Harris to harmonize on a 1976 TV appearance
A third disc in the 'Trio' series is expected later this year, with never-released recordings from the Eighties and Nineties
"Who Do You Think You Are?" kicks off SoCal crooner's debut album 'Angeleno'
"Where Is My Love" was recorded in 1987 but just recently made public
Evening wraps with Lorde, Kim Gordon, St. Vincent and Joan Jett all fronting Nirvana