Jubal definitions

Merriam Webster's

noun Etymology: Hebrew Y?bh?l Date: before 12th century a descendant of Cain who according to the account in Genesis is the father of those who play the harp and organ

Hitchcock Bible Dictionary

he that runs; a trumpet

Easton's Bible Dictionary

jubilee, music, Lamech's second son by Adah, of the line of Cain. He was the inventor of "the harp" (Heb. kinnor, properly "lyre") and "the organ" (Heb. 'ugab, properly "mouth-organ" or Pan's pipe), Gen. 4:21.

International Standard Bible Encyclopedia

joo'-bal (yubhal; for meaning see JABAL): Son of Lamech by Adah, and inventor of musical instruments (Ge 4:21).