Mary, Did You Know? (treble C instrument duet) for Piano Accompaniment,Flute,Oboe,Woodwind Duet,Violin,String Duet,Treble C instrument duet,piano accompaniment written by Kathy Mattea. The format of this sheet music is Sheet Music Single and it’s published by Sandra Zylstra. Mary, Did You Know? (treble C instrument duet) is part of the following sheet music categories: N.