For recordings of bird songs, call the following numbers. Press 9 to repeat the recording.
612-573-5617: field sparrow
612-573-5690: chipping sparrow
612-573-5644: house sparrow
612-573-5707: song sparrow
612-573-5711: vesper sparrow
Recordings from the Library of Natural Sounds, Cornell Laboratory of Ornithology. Try the lab's website: birds.cornell.edu.
