I was chatting to a friend just now and I mentioned in passing that the music in my head was particularly loud today. She was really taken aback and told me that this isn't normal. It's got me wondering how many other people constantly have music playing in their head, apart from when there's external music playing. It's usually something I've listened to recently but random songs do pop in occasionally as well. I just had Symphony of Destruction by Megadeth which I don't think I've heard for years. Music is just always there in the background and it's complete songs or sometimes albums; it isn't like earworms where you get 20 seconds of something annoying playing over and over again. It also isn't mistakable for externally-played music so it isn't a condition such as MES where you get auditory hallucinations.
I know my DH has exactly the same thing and I'm pretty sure my dad did as well because he was always walking around singing random stuff like Gilbert and Sullivan songs but he never listened to anything like that. Does anyone else experience something similar or is it as unusual as my friend says?