2016 Puzzle 10: “How Cryptic!”

Here’s contest puzzle #10. Solve using the Crossword Compiler applet below, download a PDF, or use Across Lite.
The meta for this puzzle is a hit from the late 1970s. (Ignore the word 'the' in the names of any musical artists that might be part of this puzzle's theme.)
Submit your answer to the meta using the form on the home page.

How Cryptic! by Pete Muller