Barn Swallows (Hirundo rustica) have several vocalizations. One is the normal flight call which may serve to keep the flock from flying into each other during their normally acrobatic feeding maneuvers - kind of a "feedback" call.
Third is the "sittin' around the house talkin' with friends" song. It's a rambling series of whistles, squeaks, crackles and buzzes - everyone talks at once - a delight to hear. These were all recorded around the docks at Roche Harbor, Washington, where they prefer to roost on the tallest mast in the place.
