Kenny Chesney's duet with Dave Matthews, "I'm Alive," has been sent to country radio as a single with an official add date of Aug. 17. The song is included on Chesney's latest album, Greatest Hits II, as well as his 2008 album, Lucky Old Sun. He co-wrote the song with Dean Dillon and Mark Tamburino. Willie Nelson also recorded it on his 2008 album, Moment of Forever, which Chesney co-produced. Chesney will perform on Good Morning America on Aug. 14.