i can’t remember this adorable movie title

hi guys, i can’t stop thinking about a movie i saw last year i think and the only thing i can remember is that it’s a boy and a girl, both teenagers, and they’re on a train station and she’s singing but can’t really sing in front of him or something like that. i think she also forgot her notebook with her songs on the station, so she goes back and i believe the boy is there because he saw that she left it. do you know what movie this could be?