I was recently asked what Wow and Flutter was in relation to magnetic tape. So I have tried to recreate it for them. Wow and flutter is caused but the speed of the magnetic tape increasing and decreasing. This is often caused by stretched or worn belts, a slipping capstan and pinch roller and in the case of the compact cassette the spools rubbing on the case. Thing is you learned to ignore it. There was not much you could do other than service your tape deck or replace the cassette. The analogue days were happy times. An interesting side note. The Google algorithm still managed to detect that this is a copyrighted song despite the distortion. Usually people change the pitch of the audio to confuse the algorithm this is why some of the top gear videos on you tube sound odd. I might be an interesting experiment to take a track and manipulate it in different ways to see if you can fool the algorithm. ... https://www.youtube.com/watch?v=3tdVFAvwEUs