Quite into your music it seems, how about just showing your into whatever your listening to! Start swaying then make eye contact and pull a funny face. She'll laugh, then big smile take off the headphones to talk and your in!
Sorry I can't control myself, did I distract you from the book?... etc
..what you reading etc etc... Or just open with this and put less thought towards the opener. Say you've had enough of your music and fancied a chat.
I've got a sticking point with a HB8 quite alternative lifeguard at the local pool. I never catch her at the right times, I always notice her looking my way. But when I come out of the pool and shes sitting high up I'm not comfortable with the approach plus hair etc will all be messed up and not looking my best having just come out of the pool.
If I see her before / after changing I'm going for the kill, and if I bump into her elsewhere I'm certain shes mine

'I didn't want to distract you on duty, people might start dying. Things would get messy!'