"Yesterday's Song" is a song recorded by American singer Hunter Hayes as the lead single for his upcoming fourth studio album. Hayes co-wrote the track with Barry Dean and Martin Johnson and also assisted Dann Huff with production. It was released to digital retailers on September 23, 2016 and officially impacted American country radio on October 24, 2016.

"Yesterday's Song" is a song written by Hunter Hayes, Barry Dean, and Martin Johnson about the "emotional shift" that occurs when someone important to you ceases to be a part of your life. The song's hook compares this person to a song that Hayes used to play "on repeat" but who is now "just an echo where the feeling is gone." According to Hayes, the song represents a "joyous realization that you're moving on and starting this fresh, new chapter." Musically, it is a country song with rock influences and features prominent guitar work, performed by Hayes. The track employs a wall of sound approach to its production. Hayes co-produced the song with long-term collaborator Dann Huff.

Hayes released three then-new songs ("Yesterday's Song", "Amen", and "Young Blood") to his SoundCloud page on his 25th birthday: September 9, 2016. The songs were available to stream for a limited time before they were pulled. On the writing process behind the songs, Hayes said that "this is the first time I've really been able to kind of step back from [the pressure of releasing new music] and just let my instincts and creativity flow."

All three songs were then released to digital retailers and Spotify on September 23, 2016 through Atlantic Records (in the United States) and Warner Music Group (internationally). "Yesterday's Song" was selected as an official single and was sent to American country radio stations on October 3, 2016 through Warner Bros. Records and Warner Music Nashville. It officially impacted the format on October 24, 2016.

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