(n.) One who harmonizes.

arranger ballad maker ballad singer balladist balladmonger bard composer contrapuntist ethnomusicologist fili folk singer folk-rock singer gleeman harmonist harmonizer hymnist hymnographer hymnologist jongleur librettist madrigalist melodist melodizer minnesinger minstrel musicographer musicologist orchestrator rhapsode rhapsodist scop scorer serenader song writer songsmith street singer strolling minstrel symphonist tone poet troubadour trovatore tunesmith wait wandering minstrel