2017 Puzzle 4: “Pulse Modulation”

Here’s contest puzzle #4. Solve using the Crossword Compiler applet below, download a PDF, or use Across Lite.
Something's not right with six of the entries in this grid. What song that was a hit in both the 1970s and '90s provides instructions necessary to make sense out of them?
Submit your answer to the meta using the form on the home page.

Pulse Modulation by Pete Muller