Feel like I'm at work
The rules stipulate that '...you are welcome to use less than the length of the entire song in your film,
but you may not use any additional music'.
This rule was designed to ensure entrants used the music provide by CWP as the sole soundtrack. If, during filming, your camera picks up sounds from external sources, this will not invalidate the entry. However, any video where the placement of music is a deliberate attempt to influence the mood and is clearly added in post production, will not be compliant with rule 1.
In this case, as the 'additional music' is not designed to enhance or build emotion, and is not added as a seperate layer of sound, I will allow it. Howver, any additional attempts at adding music will be frowned upon.