I've always had all kinds of auditory hallucinations while under the influence. Every now and then I can grab little snippets of the background chatter. Usually just a word or short phrase that may or may not make sense at the time. This has happened on a couple different substances, LSD, psilocybin mushrooms, and 5-meo-dipt. The 5-meo-dipt was crazy with sound. Music sounded completely different, and without music playing it still wasn't silent.
I get phantom music almost every trip. Everything from annoying pop music to the best Techno that doesn't exist yet. Once on 25c I had a full symphony playing in my brain for like 3 hours. I wouldn't let my girlfriend watch TV, listen to music, or even talk to me for fear of losing it. This annoyed her, but I was trying to remember it. I kinda chalk it up to being a musician though. I don't write the music, it channels through me.