It sounds simple, of course, but personally I can think of no more mentally arduous task than making music.
George GershwinI didn't even start playing the piano until I was about 13 or 14. I guess I must have had a little talent or whatever-you-call-it, but I practised regularly, and that's what counts.
George GershwinA skyscraper is at the same time a triumph of the machine and a tremendous emotional experience, almost breath-taking. Not merely its height but its mass and proportions are the result of an emotion, as well as of calculation.
George Gershwin