Hum a few bars of a song she likes around her.

Hum a few bars of a song she likes around her. She might think of you whenever she hears that song. And she'll probably be impressed by your good taste in music. Some girls have actually dumped guys or stopped liking guys when they insulted the music they like. So, it's OK not to like her music, but don't be insulting her favorite singer/band! Try to agree with her as much as possible but not so over the top that she knows your not being yourself ("I know, they are the best band EVER!"). Make sure the song is not overtly feminine however.
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