I remember reading the following anecdote about Grainer, repeated on Wikipedia, though neither I nor Wikipedia have a source for it:
"Grainer was amazed at the resulting piece of music and when he heard it, famously asked, "Did I write that?" Derbyshire modestly replied, "Most of it." [1]
That’s a wonderful anecdote. I would love to know what source material she had to work with… sheet music, demo tape with conventional instrumentation, just a jam session that laid out the basic themes? Probably lost in the mists of time. No, wait, TO THE TARDIS EVERYBODY!!!
I heard that one in one of the documentaries I went throught when I followed the first link yesterday. Can't remember where though. I think it was a quote from a phone conversation with Derbyshire.
[1]. https://en.wikipedia.org/wiki/Doctor_Who_theme_music#:~:text....