The 15.6 KHz sound from CRT televisions used to really bother me when I was a child. I think I was particularly sensitive to it for some reason. Back then I happened to notice that same frequency on the song "Mercy Street" by Peter Gabriel (on the album "So"). It's throughout the entire song. The 2012 remastered album has since filtered it out.<br>Peter was known for his use of the Fairlight CMI at the time (1986), and I suspect the noise from its CRT may have bled through on to the recording.