I'm a writer, not a musician, but I've had occasional dreams where I hear amazing classical music. Really beautiful stuff.
I'm not an expert at all in classical music. I've never really listened to it to a big extent. I love some of it, but overall I'm just not intimate with it.
Interestingly enough, when I try to listen to classical music when writing, I can't, because I find myself absorbed in the music. I wish I could use it for background, but I seem incapable of that.
So the dreams are interesting. They make me wonder if I could have been a musician. I dabbled with guitar when I was young but never put in the time needed (I wrote like a fiend, however, lol).
Anyway, I can easily imagine your experience. That sounds amazing.