This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
The version of the song on Combat Rock, as well as many other Clash compilations, features an electronic sound effect beginning at the 1:52 minute point of the song. This noise is a monophonic version of the song “Dixie”. The sound effect source was generated by the alarm from a digital wristwatch that Mick Jones owned.
It was a digital wristwatch:
Neat. I guess I never bothered to look into it haha