Wolfgang Amadéus Mozart: 9 Variations on a minuet by Duport K. 573 in D Major from Variations - piano sheet music to print instantly. This piece is level 8+ and was composed during the Classical period. This piece is composed by Wolfgang Amadéus Mozart and was published in 1789. Title: 9 Variations on a minuet by Duport, K. 573 in D Major from Variations. The difficulty level if graded by ABRSM would be approximately 8+ and it belongs to the Classical period.