Btw, Lionel Bart, composer and lyricist of the musical Oliver!, also did not do musical notation. He hummed the tunes to a fellow musician who transcribed them.

Btw, Lionel Bart, composer and lyricist of the musical Oliver!, also did not do musical notation. He hummed the tunes to a fellow musician who transcribed them. I've no idea how much 'filling in' the other musician did in terms of harmony, arrangement and so on. But here's another question: if Bart had formally learnt to read music, or Goodwin had written his songs down, would they still have been able to compose them?