Chris 1 and Chris 2: Data is nice, but what's the context? The Beatles started in an entirely singles-sales industry, so people needed to know the title of the song to ask for at the record store. Top 40 radio ruled a monoculture in which everyone listened to the same songs, and radio DJs announced and then back-announced the name and title of each song. The 1970s audience fragmented, and the knock on disco was that some songs consisted of nothing but the title, repeated. ("Boogie Oogie Oogie" to "Stayin' Alive" and "Fly Robin Fly.") I don't know if Chris G. has spotted a trend, or is just jammin' on numbers. Since streaming, the Billboard charts are almost useless, since artists load up on tracks declared "singles" and monopolize charts that only a contortionist could comprehend. But writing is about telling stories, searching for meaning. The data don't move me, daddy-o!