Challenge 1: Music That Sounds Good Alone but Drowns Out Narration — Solution Walkthrough

The answer:

This is exactly the mistake this chapter's own warning box describes.
The music was checked in isolation, where any reasonable volume can
sound fine on its own — but the actual test that matters is how the
music sits relative to the narration once both tracks are playing
together, and that check was skipped.

Why previewing music alone isn't a reliable check:

A volume that "sounds good" by itself gives no information about
whether it's actually low enough to let the narration stay clearly
understandable. Music competing at a similar volume to speech forces
listeners to work harder to follow the words, exactly the outcome
described in the scenario.

What should have happened instead:

Per this chapter's own guidance, background music typically needs to
sit noticeably quieter than narration — several decibels down — and
that balance needs to be confirmed by listening to both tracks
together, not by judging the music track in isolation.

WHY THIS WORKS AS AN ANSWER
------------------------------
This exercise checks that the root cause is correctly identified as
checking the music in isolation rather than against the narration,
matching this chapter's own explicit warning.