What is the proper noun of music?

A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'music' is the name of a piece of music, for example Beethoven's Fifth Symphony, Paul McCartney's 'Let It Be'; or:

• The Music Box Theatre, West 45th Street, New York, NY
• Music Street, New Orleans, LA or Music Street, Chagrin Falls, OH
• 'The Sound of Music', 1965 movie with Julie Andrews and Christopher Plummer