A composer.
A Librettist
... is called the composer.
Lyrisist, is a person who writes lyrics. A lyricist.
A person who writes music is called a music composer or a songwriter. A singer-songwriter is one who writes, composes and sing their own music material.Someone who solely writes lyrics may be called a lyricist, and someone who only writes music may be called a composer.
A composer, or more specifically a 'symphonist', although the latter word is not used very often.
score
Testator.
The person who writes a check is called the payor. Or in the case of my brother, a sucker, when he writes another check for his girlfriend.
An author.
a publisist a bigraphy
composer
a playwright
This is a poet
A person who writes newspaper articles is called a journalist or a reporter.
A person who writes newspaper articles is called a journalist or a reporter.
A Librettist
... is called the composer.