The new Disney+ doc gives an insight into Williams' life and prolific career.
After 50-plus years writing film music,John Williamshas become a singular pop culture entity.
He is responsible for theStar WarsImperial March, the soundtrack to E.T.

Gustavo Dudamel (L) and John Williams.Travers Jacobs/ Lucasfilm Ltd.
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But Williams father, a musician himself, made him practice proportionally to the time he spent playing baseball.
If he played baseball for an hour, he had to practice the piano for 30 minutes.

John Williams.Travers Jacobs/ Lucasfilm Ltd.
He wanted to go by Johnny
You may have heard Spielberg refer to Williams as Johnny.
It is the name the composer uses with friends, close collaborators, and family.
Originally, he was also credited as Johnny Williams.

John Williams (L) and Steven Spielberg.Travers Jacobs/ Lucasfilm Ltd.
But a colleague urged him to switch to John because it sounded more professional.
He says, Im too busy to learn new technology.
But he also admits that it probably takes him longer than his younger colleagues to write a score.
Eventually, he became the Boston Pops conductor from 1980 to 1993.
He was fighting an uphill battle against concert musicians who didnt consider film music to be real music.
He names Ford as a particular favorite actor.
It gives me a lot to write for.
Williams promptly began to hum the theme along with Quan, instantly remembering.
He feared no one would get the “Yodas Theme” Easter egg inE.T.
trick or treats dressed as Yoda on Halloween.
Concerned, he asked Spielberg if anyone would get it.
Spielberg replied, Yeah, about 2 million people.
After being approached, Perlman said he needed to think about it.
He called back and signed on immediately.
Im jealous of keeping the integrity of what Ive already done, he explains.