Lady Gaga and Bradley Cooper perform this in the 2018 movie A Star Is Born, a love story about an established musician who is eclipsed by his protégé. Gaga wrote the song with Lukas Nelson, who also produced it.
"Music to my ears" happens when someone tells you good news. "Music to my eyes" is a play on that phrase meaning to see something you like.
The song is a series of musical metaphors that the couple use to adulate each other. First Cooper sings about how he wants to "sing along" and "learn your every line." Then it's Gaga's turn; she wants to "be the strings on your guitar." Fittingly, they harmonize in the chorus.
Bradley Cooper did his own singing and wrote some of the songs for A Star Is Born. Nelson served as his musical mentor and appears in the movie, playing a member of the backing band.
Nelson got to know Cooper's voice, which informed how he wrote this song, but the process was similar to how he writes and records with his band, Promise Of The Real. Nelson planned to perform the song at their concerts.
Lukas Nelson says he was "feeling poetic" when he wrote this song. That feeling was enhances by some tokes of Willie's Reserve, his father Willie's brand of (legal) marijuana.
"I remember having a moment with that song deep inside," he told Entertainment Weekly. "That one was the one that I feel was mostly mine."