Spectrogram of bluethroat song (= Mastersingers, Bluethroat 4). Four kilometers north Nordsätern, Härjedalen, June 9 (?) 2012. Sound: Telinga Pro 5 parabole with stereo DAT mic, recorded on the camera tape. The background noise is the river Storån. Some noise filtering was done for this movie. Sonogram from Izotope RX, screen capture with Debut v. 1.83.