Julian Donahue is in love with his iPod.Each song that shuffles through “that greatest of all human inventions” triggers a memory. There are songs for the girls from when he was single; there’s the one for the day he met his wife-to-be, and another for the day his son was born. But when his family falls apart, even music loses its hold on him, and he has nothing.Until one snowy night in Brooklyn, when his life’s soundtrack–and life itself–starts to play again. He stumbles into a bar and sees Cait O’Dwyer, a flame-haired Irish rock singer, performing with her band, and a strange and unlikely love affair is ignited.Over the next few months, Julian and Cait’s passion for music and each other is played out, though they never meet.