The cache is not at the posted coordinates.
You can obtain the full north coordinates for this cache by finding GC65073 The Million Dollar Piano - Ebony Keys.
You can obtain the full west coordinates for this cache by finding GC6507F The Million Dollar Piano - Ivory Keys.
You are looking for, well, what else, a piano of sorts.
Difficulty is only reflective of the requirements needed for getting the coordinates for this cache. YOU CAN NOW COLLECT THE SECRET SONGS FROM THE CACHE DESCRIPTIONS OF EACH INDIVIDUAL CACHE. The actual difficulty of the final location is around a 1.5. The terrain rating properly reflects the final location.