Trio is a collaboration album by three American performers, Dolly Parton, Linda Ronstadt and Emmylou Harris. The album, released in 1987, sold over 4 million copies worldwide and also received several awards, including two Grammy Awards. Parton, Ronstadt, and Harris released a second album, Trio II, in 1999.
Longtime friends and admirers of one another, Parton, Ronstadt and Harris first attempted to record an album together in the mid-1970s, but scheduling conflicts and other difficulties (including the fact that the three women all recorded for different record labels) prevented its release. Some of the fruits of those aborted 1970s recording sessions did make it onto the women's respective solo recordings. "Mister Sandman" and "Evangeline" appeared on Harris' album Evangeline and Parton's "My Blue Tears" was included on Ronstadt's 1982 album Get Closer. Rodney Crowell's "Even Cowgirls Get the Blues" was on Harris' Blue Kentucky Girl album. Parton and Ronstadt also recorded a version of the traditional ballad "I Never Will Marry", which appeared on Ronstadt's 1977 Simple Dreams album, though that was recorded separately from these sessions. (During this time, Ronstadt and Harris also covered a number of Parton's compositions—Harris covered "Coat of Many Colors" and "To Daddy", and Ronstadt recorded "I Will Always Love You"—for inclusion on their various solo albums during the mid- to late-1970s; Parton covered Harris' "Boulder to Birmingham" in 1976, including it on her All I Can Do album.)