This website features the songs of 80 different insects, including different species of crickets, katydids, grasshoppers, and cicadas. The makers of the site have also written a book, The Songs of Insects.
According to the authors, "By studying the rich content on this site and in our book, you will learn all the common crickets, katydids, and cicadas of eastern and central North America, when and where to search for them, and how to identify them by their appearance and by their songs. You will also learn the best ways to locate, capture, and keep insects, along with basic techniques for photographing them and recording their songs. Last but not least, you will hone the fine art of insect song appreciation, where the cacophony of confusing insect sounds magically transforms into a delicate concert of creatures dear to the heart." Click here to listen to the Songs of Insects.