Rogers Refuge, down along the StonyBrook in Princeton, is rockin' to the sounds of the frog choir this time of year. The low-tech microphone for this brief video doesn't do justice to the recording artists, which when heard live sound bright and cheerily raucous. Spring peepers are in the sonic foreground, with wood frogs as a gobblely undercurrent.
To browse among photos and recordings of various frog species, try this website. Though the road to Rogers Refuge was washed out by recent floods, it's been fixed up and can be negotiated if you don't mind bouncing through some potholes, which contribute to the outback charm of this hidden habitat.
Another place to hear spring peepers is at Mountain Lakes, just down the gravel road past Mountain Lakes House.