"Peg" is a song by Americanrock group, Steely Dan, first released on the band's 1977 album titled Aja. The track was released as single in 1977 and reached number 11 on the US Billboard chart in 1978 and number eight on the Cash Box chart. In Canada, "Peg" spent three weeks at number seven during March 1978.
Like many of their songs, it is a blend of rock, jazz and R&B; the song also incorporates disco into this blend. The song's guitar solo was attempted by seven top studio session guitarists ‒ including Robben Ford ‒ before Jay Graydon's version became the "keeper". He worked on the song for about six hours before the band was satisfied.
Michael McDonald can be heard providing multi-tracked backup vocals in the choruses, and keyboardist Paul Griffin can also be heard improvising background vocals in the final chorus and fadeout.