That first minimalist piece was written by Terry Riley.
In a symphony written in this key's relative minor, an "Alma" theme represents the composer's wife. That symphony in this key's relative minor is Mahler's sixth, subtitled the Tragic. A piece titled after this key involves 53 measures that can be repeated according to the performers' tastes. That first minimalist piece was written by Terry Riley. Schubert wrote his final completed symphony in this key and subsequently called it the great one to distinguish it from his sixth symphony, "the little" one. For 10 points, name this letter that denotes the relative major of A minor and has neither sharps nor flats.
In a symphony written in this key's relative minor, an "Alma" theme represents the composer's wife.
{C} major [do not accept “C sharp/flat major”]