My son is a composer, and he told me that he doesn't even need a keyboard any more, when he composes (he composes on paper, then transfers it to music notation software when it's ready to distribute).
He also, sometimes, has a photographic memory for music. In university he had a listening test on a piece of classical music. He was able to visualize the score that he had studied when in high school, and identify the types and numbers of instruments.
He also, sometimes, has a photographic memory for music. In university he had a listening test on a piece of classical music. He was able to visualize the score that he had studied when in high school, and identify the types and numbers of instruments.