Mozart didn't write he composed music. So to answer your question the answer is zero or none.
Mozarts career was an opeara musican
Writing was not Shakespeare's only career, and probably not his first.
The requirements for a sports writer you Can go online and do a search to find out where you can find a career in sports writing. For sports writing there should be alot of opitions in the jobs for a career in sports writing.
When did Norman Lear start his tv writing career?
If one can write well, then yes, writing is a lucrative career choice.
Mozarts mother's name was Anna Maria
she started her career by writing songs
Helen Keller's career was writing books. She was an author.
His dad
Salzburg
No.
Shakespeare started writing plays in about 1590 and retired from doing it in 1613. He seems to have been popular and successful at all stages of his career.