Also, most commercial radio DJs would talk and talk and talk all the way up to the point in the song where lyrics started, and then right after the last lyric, they'd start yacking again. A lot of music that was on the radio in the 70s, 80s and 90s had great instrumental intros and outros that you just totally missed because some garbage DJ had to get in one last "TODAY'S HITS, YESTERDAY'S LEGENDS, ONLY ON IDIOT ROCK 95.1!!!"
Back in the later 70s a Chicago three-letter AM radio station used to speed up songs so they could stuff in more commercials. And the DJ would do the parent’s talking when there’s no lyrics, even to the point of talking through the entire Love Unlimited Orchestra’s Love’s Theme instrumental.
I never understood the business reason for doing this. Do they really think listeners will switch away if they go 500 milliseconds without hearing a human voice?
It’s the opposite, they do it to fit in more commercials, because apparently people don’t switch away when they talk over songs.