Music/singing is a language that all people can understand in varying degrees, it is the only “universal language”. In Shmuel Alef, Right after Shmuel and Shaul meet for the first time, Smuel Hanavi tells Shaul a few things that will happen to him on his way home, one of them(I think it is the last one) was that he would prophesize with a bunch of other prophets, the way that the prophets would elevate themselves spiritually would be through music.