Thirteen was a 1986 Emmylou Harris album. The title came from its status as her thirteenth studio album (if one doesn't count her 1970 independent label debut, which Harris herself rarely acknowledges). The album included an unusually high number of covers, including Merle Haggard's "Today I Started Loving You Again", Sam Phillips' "Mystery Train", Jack Clement's "Just Someone I Used to Know" (a 1969 duet hit for Dolly Parton and Porter Wagoner; here, Harris is teamed with country singer John Anderson), Bruce Springsteen's "My Father's House", and Rodney Crowell's "I Had My Heart Set on You".