The solution to The Orchestra can be found in the 13 caches that make up the Orchestra series. Each cache contains a puzzle piece that will lead you to the solution. The numbers in the coordinates are not in the order in which the caches are listed. It's up to you to put it all together. FTF gets an unactivated travel bug.
The Orchestra: Flute GC4JTFP
The Orchestra: Oboe GC4JTFY
The Orchestra: Bassoon GC4JTG2
The Orchestra: Clarinet GC4JTG9
The Orchestra: Trumpet GC4JTGF
The Orchestra: French Horn GC4JTGM
The Orchestra: Trombone GC4JTGV
The Orchestra: Tuba GC4JTH2
The Orchestra: Percussion GC4JTH9
The Orchestra: Violin GC4JTHE
The Orchestra: Viola GC4JTHP
The Orchestra: Cello GC4JTJ1
The Orchestra: Bass GC4JTJ6