When Tom Petty met Stevie Nicks early in his career. She asked him if he could write a song for her to record. Petty didn’t take her seriously until Nicks reiterated her request a year later .
Petty wrote a ballad called “Insider” recorded a demo with his band, and sent Nicks the track. After listening to the demo, Nicks visited Petty at his studio, taped the song with him. She then gave the tape to Petty, saying, “You love this so much… YOU take the song.” He did, and included it on his next album.
Petty and the band recorded a song that he and guitarist Mike Campbell composed about a year earlier -they sent that demo to Nicks. She loved it, and decided to do it as a duet.