Mobile ring tone help

It's not a ringtone; he's listening to a CD of Cosi Fan Tutte*, and he turns it off to answer his phone. (He resumes playing it when we see him next -- Sarah Harting is in the passenger seat, and the implication is that she was in the car while he was on the phone with Marcus, the tabloid editor who thought he'd gotten the better of Charles.)

*An opera about two young betrothed couples and questions of fidelity and trust; its title translates to Thus Do All Women or, more colloquially, Women Are Like That (tho one could say that of men, too, as the two men in the opera are the ones who set out to trick the women into being unfaithful)

"All you need to start an asylum is an empty room and the right kind of people."