Bhai Satta, also called Satta Dum because he was a dum or mirasl by birth, a Rababior (Rebeck player) to Guru Arjan, and co - composer, with Rai Balvand, of Ramkali ki Var, included in the Guru Granth Sahib in the Ramkali musical measure. He served Guru Angad, Guru Amar Das, Guru Ram Das and Guru Arjun Dev. Along with his fellow musician Balwand, they jointly composed a ballad which appears in the Guru Granth...See here