Who was the first composer?

First Composer

The guy who first put two notes together would be the first composer. Since then it has gotten much more complex as new instruments are created and combined to play together.

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.