Superstore music is usually played during scene changes showing customers and their odd behaviour. It's also played during key scenes with the show characters. When songs are played is shown in each episode plot section. The original artist is noted when a generic cover of the song is played. Its first appearance is in the Season One episode "Pilot".
Dina turns the store's lights off which reveals glow stars Jonah has put on the ceiling to create a moment of beauty for Amy. It also plays at the episode end as Amy looks up at the night sky, smiles, and puts her wedding ring on.