Answer:
Strauss waltz
Step-by-step explanation:
A writer should always put in italics, any citation to names of ships, books, magazines, newspapers, movies, music, stories, poems, plays, radio and television programs, works of art, paintings, sculptures and CDs.
In this excerpt, the author cites the "Waltz of Strauss", as this is a reference to a song, which is also a work of art, should be in italics.