'Jubal,' as in Genesis 4:21, signifies the doctrine of spiritual things in the church that came after Lamech. Being 'the father of the harp and organ players' signifies the truths and good things of faith.

(Referencias: Arcana Coelestia 417)

417. Verse 21 And his brother's name was Jubal. He was the father of all who play upon the harp and organ.

'His brother's name was Jubal' means doctrine concerning the spiritual things of this same Church, and 'the father of all who play upon the harp and organ' the truths and goods of faith.