Spectrogram of marsh warbler song(= Mastersingers, Marsh warbler 4). Sv: Kärrsångare. Hålanda, Sweden, 01.00 AM, 16 June 2014. The unfiltered recording consists of 14 consecutive minutes and the movie may take time to load. Telinga LX002 parabole with stereo DAT mic, recorded on Zoom H2. Sonogram from Izotope RX2 v. 2.10, screen capture with Debut v. 1.83.