Power Ballad

Rick Power is the American lead singer in a Dublin-based wedding band, The Bride and Groove, who has given up on his dreams of musical stardom after marrying his Irish girlfriend, Rachel, and having a daughter with her, Aja. While performing at a castle wedding, the band meets Danny Wilson, a famous singer who is attempting to launch a solo album after finding success in a boy band. After joining the band onstage, Danny later spends the evening with Rick, during which they drink, smoke marijuana, and share music. Rick performs an original song he wrote, "How to Write a Song (Without You)".

After returning to Los Angeles, Danny struggles to find material for his solo album, and his producer, Mac, criticizes his songs as generic. Trying to find inspiration, Danny plays Rick's song which his girlfriend, Marcia, overhears and encourages him to record and release. Six months later, the song becomes a major hit and revives Danny's career. After hearing it while shopping, Rick attempts to convince others that he wrote the song, but is unable to prove it. Danny's record label dismisses Rick's claims and threatens legal action if he continues contacting them.

When a bride requests the song at a wedding, Rick refuses to perform it and is fired from the band after attacking the drummer. After crashing his van with Rachel and Aja both inside, Rachel kicks him out of the house. Desperate to receive credit, Rick convinces his bandmate, Sandy, to come with him to Los Angeles. The two attend Danny's concert at the L.A. Forum and sneak into the afterparty at his home. Rick confronts Danny and demands recognition for writing the song, but Danny refuses. Rick reveals that the song is not a love song, but a song written for Aja about fatherhood. Rick and Sandy are then kicked out of the party.

Returning to Ireland, Rick accepts that he is unlikely to receive credit and reconciles with his family and rejoins The Bride and Groove. Later, Rick and Danny each perform the song separately, Rick at a wedding, and Danny at Madison Square Garden. While looking through old photographs and videos on Rick's computer, Aja discovers a home video from when she was two years old that shows Rick singing the song to her, providing proof that he wrote the song. Several months later, Rick donates a large amount of money to a busker.