When I first encountered this website, I didn't even know what an "aircheck" was. I eventually found a glossary of radio jargon that gave this definition: "recording of a live broadcast". The recordings at the above website include all kinds of things -- commercials, popular songs, intro and "patter" by DJ's, station ID's and jingles, bumpers -- and other things that I don't even know the proper jargon words to describe. They all come from top-40 stations. They have their own top 40 list of recordings, and they include recordings of Wolfman Jack from 1975, Alan Freed from 1955, Casey Kasem from 1972, and others you might recognize. Nostalgia galore!