A few years back, I met my father. On March 4th, 2012, he invited me to dinner at his place in Colfax, CA, which is a fairly wooded area in the northern foothills. As I pulled up to the driveway and got out of my car, I noticed a tiny pond formed around a septic tank with what must have been a few dozen frogs who stopped croaking as I approached. I left my H4n recording at the foot of the pond, and went inside for the rest of the evening. After retrieving my field recorder and listening to it later, I was so pleased to hear what was recorded here, as a passing train in the dark had added it's own deep, dark tones to the frogs' song.