Genesis 4:21

And his brother's name was Jubal: he was the father of all such as handle the harp and organ.

1. Lamech, a descendant of Cain, and Adah his wife also had another son named Jubal.
2. Jubal's descendants were musicians and played the harp and the organ. They may have also built these musical instruments.
3. Trades and talents in these early times appear to have followed and remained within family lines.