This cache is part of the music series, and you'll want to take note of the number on the cache for future reference.
Archduke + Ghost + Dumky
Serioso + Appassionata
Souvenir de Florence
The Joke + Death and the Maiden
Intimate Letters + From My Life + Moonlight
Emperor + The Harp
You can check your answers for this puzzle on Geochecker.com.