This geocache is part of the Murweh Triangle Geoart. It is NOT at the published coordinates. To find the cache, you need to work through the following.
In Music, a triangle is a percussion instrument consisting of a steel rod bent into a triangle with one corner left open. It is suspended by a gut or nylon loop and struck with a steel rod. It is theoretically an instrument of indefinite pitch, for its fundamental pitch is obscured by its nonharmonic overtones. It is also known as an idiophone type of musical instrument in the percussion family.
On the surface, it seems like a really simple instrument to play.
BUT here is a link to a Percussionist's perspective. Please read it.
The triangle is an instrument percussionists don't play very often, and when music is scored for one, often there is a lot of counting bars and bars of rests so that you come in at just the right moment!
Cartoonist Gerard Hoffnung sums it up well.
After all that, you then have to consider how exposed you will be when you play. Will you be part of one giant orchestral sound, or are you all by yourself? Perhaps one of the most exposed performances on the Triangle is in the final section of a Concerto for Piano and Orchersta (No. 1) written by Franz Liszt.
Watch this video excerpt of a short (45 seconds) extract from a performance of the Concerto. You can see when the cameras focus on the triangle player.
Count how many times you SEE the percussionist play the triangle. You can HEAR more than what you can see, but the question is designed for our hearing-impaired geocaching friends.
VIDEO LINK  [NOTE: This is a You Tube link).  [Full Video (21 minutes) if you like what you see/hear]
You can validate your puzzle solution with certitude.