Margus Põldsepp was born in Paide.[1] He graduated from Valga Children's Music School in 1985 and Valga Gymnasium and in 1987.[2] He has been collecting folklore since he was a student, using it in his musical work.
From 1995 until 2002, he was the musical director of the Ugala theatre in Viljandi.[1]
Põldsepp has been the director of the Karksi-Nuia Music School since 2007, supervising folk music ensembles in Karksi-Nuia, the best known of which is Tuulepuu.[2]