Every Sunday from 10 a.m. to 2 p.m., we listen to Sunday Morning Country on Boston College's radio station, WZBC (90.3FM, streaming at http://wzbc.org/listen.html) hosted by the incomparable Cousin Kate. That's what you're hearing in the background. The sparrows were very excited because we had just refilled the birdfeeder. It was mesmerizing to watch them swoop in and out, sometimes singly, sometimes en masse, seemingly in time to the music.