For recordings of bird songs, call 612-673-7800, and when prompted press the following four-digit numbers:
1238 American woodcock
1237 common loon
1236 great crested flycatcher
1235 pied-billed grebe
1234 sedge wren
1233 whip-poor-will
Recordings from the Library of Natural Sounds, Cornell Laboratory of Ornithology. Try the lab's website: www.birds.cornell.edu.