Having an ear for music and some rhythm, will prove helpful. I have attempted to make this as easy for you as I can. This song will certainly bring back some old memories.
This uniuque cache will provide you with everything you need to solve for the combination on this locked cache. I have a few gadget caches out in Uxbridge so, if you have found any of the others, you will know the basic container to be looking for 
. It should be easy to spot and decorated in such a fashion that that you will know you have, without a doubt found ground zero!
You will be playing a musical instrument, but singing out loud will not be needed.
You may find it helpful to print off the cache page and bring it along with you.
Please be sure to leave everything provided with the cache. You hold the key to the next cacher's enjoyment. PLEASE be gentle and return everything and be sure to shut everything up when you leave
Play this song
One, One, Five, Five, Six, Six, Five
Four, Four, Three, Three, Two, Two, One
Five, Five, Four, Four, Three, Three, Two
Five, Five, Four, Four, Three, Three, Two
One, One, Five, Five, Six, Six, Five
A, A, B, B, C, C, D
Where A, B, C and D equate to numbers. These numbers will be required to open the cache.
Each note has a number associated with it painted on the instrument. By solving the remainder of the tune, you will have soved for the 4 numbers you need to open the lock.
To open the lock:
- Enter the combination
- Depress and release the shackle, and the lock will open.
- To re-lock it you need to close the shackle (and hold closed), mix the numbers, then release the shackle.
Please remember to place the lock back on so it is facing front as labeled.
Geocaching is a great community of people, and credit for this cache idea goes to WVTim 
We hope you enjoy this one!
remman gets a big congratulations for FTF!! 