Eastern Whip-poor-will song, normal delivery followed by a subdued version (June, NJ).
During interactions Whip-poor-wills make a Swainson's Thrush-like whip. Here a bird is singing when a second bird flies by calling and then begins rapidly singing (Apr, NJ).
Chuck-will's-widow at dusk, Dividing Creek, NJ (May).
Chuck-will's-widows have a number of calls (before sunrise, May, DE):
Heron-like quok calls by bird that was at least initially in flight.
Growls and clucking calls
Calls in a series
Common Nighthawk peent and "boom" where the bird dives and creates a sound with its primary wing feathers (dusk, May, NJ).
peent followed by boom
The American Woodcock call is similar to that of the nighthawk (dawn,Feb, NJ).