Quoc: "Free Bird", or "Freebird", is a power ballad performed by American rock band Lynyrd Skynyrd. The song was first featured on the band's debut album in 1973 and has been included on subsequent albums released by the band, including the previously unreleased, unfaded-ending version of the original recording (featured on Skynyrd's Innyrds).

Answer this question based on the passage: when did the song free bird come out?
HW Chung: OK, some thoughts:
The relevant information is: The song was first featured on the band's debut album in 1973 and has been included on subsequent albums released by the band, including the previously unreleased, unfaded-ending version of the original recording (featured on Skynyrd's Innyrds). The answer is 1973.