If you rely on religious texts for the answer, then Jubal would be the first composer that we know about. (Genesis 4:21)
If you do not rely on religious texts, then Hildegard of Bingen is the earliest verified composer of music in Europe.
St. Yared, a composer and a choreographer who lived in Aksum(Ethiopia) in the 6th century AD. He is credited for inventing the zema of the Church; the chant that has been in use continuously for the last almost 1500 years.
Jubal was the first composer/musician
No, Mozart was.
Nobody knows who the first great composer really was. This is because their music has not survived into the modern day.
There was no single composer, though Pope Gregory was the first to organized them
The original composer of The First Nowell (old spelling) is unknown today. It was first published in Carols Ancient and Modern in 1823. It is best known in a harmonization by the English composer, Sir John Stainer.
Ludwig van Beethoven is considered to be the composer who bridged the transition from the Classical to the Romantic era.
The composer Khachaturian's first name is Aram.
Schumann and Chopin are amongst the very first.
Jerome Kern was a composer of Broadway shows, songs and movie musicals.
A successful living
He is Irving Berlin.