I also find it a very  intriguing subject. I for one feel like being on the exact opposite of the Spectrum to Aphantasia. I can imagine anything at anytime very clearly in my head, and can also recall the smallest details of imagines or pictures in my head. I have a ongoing monolog in my head 24/7 and something you could almost describe as a soundtrack off life. It can only be an "earworm" or even composed music pieces from my unconscious. Although when I try to think of a song I first most of the time just sing it in my head. Other times it also can be like listening to the radio. Generally I find it harder with pieces that have lyrics. But the most extreme examples for me are when I dreaming. My dreams are more or less like watching movies. With a soundtrack composed from my unconscious, sometimes even intire orchestral pieces. Often the dreams start with an scenario and I later can decide what happens, a little bit like a video game. The most extreme example by far although was a dream where I was performing on stage on a talent show. For some reason I didn't know my song anymore and so to girls came up the stage and helpt me (apparently we were a trio). It was a song that my brain came up on the spot, with perfect harmonies between our three voices. I remember after the song finished not believing how it happened and saying in my dream: "wow harmonies" Sadly with what happens with most dreams I forget them again as I wake up and so also the music. That means sometimes I know that it happened but I can't recall the actual melodies or the whole pieces, so all of these masterpiece just get lost somewhere in my brain never to be heard again.

I also find it a very  intriguing subject. I for one feel like being on the exact opposite of the Spectrum to Aphantasia. I can imagine anything at anytime very clearly in my head, and can also recall the smallest details of imagines or pictures in my head. I have a ongoing monolog in my head 24/7 and something you could almost describe as a soundtrack off life. It can only be an "earworm" or even composed music pieces from my unconscious. Although when I try to think of a song I first most of the time just sing it in my head. Other times it also can be like listening to the radio. Generally I find it harder with pieces that have lyrics. But the most extreme examples for me are when I dreaming. My dreams are more or less like watching movies. With a soundtrack composed from my unconscious, sometimes even intire orchestral pieces. Often the dreams start with an scenario and I later can decide what happens, a little bit like a video game. The most extreme example by far although was a dream where I was performing on stage on a talent show. For some reason I didn't know my song anymore and so to girls came up the stage and helpt me (apparently we were a trio). It was a song that my brain came up on the spot, with perfect harmonies between our three voices. I remember after the song finished not believing how it happened and saying in my dream: "wow harmonies" Sadly with what happens with most dreams I forget them again as I wake up and so also the music. That means sometimes I know that it happened but I can't recall the actual melodies or the whole pieces, so all of these masterpiece just get lost somewhere in my brain never to be heard again.