Genesis 4:21 - Clarke's commentary and critical notes on the Bible

And his brother's name was Jubal: he was the father of all such as handle the harp and organ. Jubal - the father - i.e. The inventor of musical instruments, such as the כנור kinnor, which we translate harp, and the עוגב ugab, which we render organ; it is very likely that both words are generic, the former including under it all stringed instruments, and the latter, all wind instruments.