I doubt anyone has sufficient introspective powers over their own brains to answer this satisfactorily.
Or: I expect answers more complicated than "because it sounds good (to me)" to be mostly confabulation...
OK, but then what is it about music that makes it difficult for people to say why they like it?
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous "stupid" questions thread went to over 800 comments in two and a half weeks, so I think it's time for a new one.