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I have music running in my head most of the time, at least in the background unless I’m concentrating deeply on something. I’m also a musician and the best way I can describe it is that the music I’m hearing in my head somehow comes out of my instrument.
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I do. I can "play it back" in my head, with full music/lyrics/chords/etc.
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I have aphantasia, and I think my experience with music is similar.

I can think about a song, think about the melody, lyrics, etc… but I don’t hear it. If I hear a couple notes that remind me of a song, I can go through the rest of the intro, get to where the lyrics start, and get to the chorus and remember the name of the song (if it doesn’t come to me instantly), but it’s nothing like playback. It’s more like my inner monologue doing a bad a cappella cover version.

I sometimes wonder if everyone is talking about the same thing, but using different language to describe it. Some being more vivid and metaphorical in their speech than others.

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I do and just asked around among friends. Everyone did.
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Most I think, especially among musicians, which makes the GP fascinating to me!
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I can play the piano, saxaphone, and guitar, and I've never considered being able to think about music to be actually hearing it.
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Can you literally hear music in a dream have you never had an auditorial hallucination?
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Yes I've had auditorial hallucinations. It was clearly inside my head, I was not "hearing" it
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