Another idea based around taking input from the phone and matching it within a database.
My sister has a phone with that music database matching service. I didn't think it would really be all that interesting, but it did match just about any song I would throw at it. (Not some of the indie stuff, but some really obscure songs.) She's found some really little known South African band from some clip on TV.
Rosalina: But you didn't.
Robert: But I DON'T.
Rosalina: You sure that's right?
Robert: I was going to HAVE told you they'd come?
Rosalina: No.
Robert: The subjunctive?
Rosalina: That's not the subjunctive.
Robert: I don't think the syntax has been invented yet.
Rosalina: It would have had to have had been.
Robert: Had to have...had...been? That can't be right.