Just a bit of background. Here is where you would find Rangely, Colorado
And an introduction to the Tank from the Tank's webpage
The Tank is an acoustical marvel, a senses-altering experience found nowhere else on earth. A 60′ tall, 30′ across rusted steel water tank – never used – was discovered in Colorado by sound artist and sonic thinker Bruce Odland in 1976. A small group of musicians has been recording there ever since. The Tank is a sonic wonder of the world, with a shifting, swirling reverberation longer and richer than the Taj Majal or the Great Pyramid. Sitting unnoticed in the dirt hills outside Rangely, Colorado – surrounded by oil pumps and dirt bike trails – the profound acoustic beauty within is balanced by the austerity of its remote location and its simple industrial architecture.
Looking into the Tank