Hmmm, not so guilty pleasure, as i never feel guilty, but another take on this for me are artists/ bands who i mainly play when alone, and never with friends.
A good example would be ' the incredible string band'. First heard them when a friend was given one of their LP;s when we were young. We were both into Zep/Floyd etc and folkish stuff Pentangle/ John Martyn and the like, so incredible string band we thought must be, well, incredible.
We laughed so much on first play. Out of tune, very muddled as in no structure to any tunes, but there was 10 seconds of pure genius.
Myself and my friend would take turns standing by the turntable to keep queuing back to start of those 10 seconds. We soon got bored doing that, and would just let it play to end of the song. Then que start of song, eventually was just playing the whole LP from the start. Those 10 seconds now made more sense in the bigger picture, and we kind of understood the whole thing. The joys of LP;s and not being able to skip forward at a touch of button.
To this day, if i want people to leave my place after a party, i will put the string band on, they soon leave. So guilty i like them no, but i kind of keep it secret as in the passed spent so much time trying to explain why i like them etc, that best not to play anything by them when i have company.
Kraken, Saturn, Emotion, Flying V Rocket, Planets.