Blue Whale songs consist of an A call, a series of pulses, followed by a long, low moan called the B call. This A-B sequence is repeated over and over again, approximately once every 130 seconds.

Up to 26,545 blue whale songs in the Antarctic were captured by ... The result was 626 hours of audio registered in real time including 26,545 songs - or vocalizations - produced by the gigantic ...