Background tunes make or break and TV show or production and have to be carefully chosen and used rather often.
A small commentary with upbeat music playing between scenes is worlds apart in quality from a regular commentary.
I have been collecting music ideas for over a year now and have hundreds of titles in mind, however you can’t ever have to many.
Full songs won’t be used, nothing longer than a minute or so most likely.
Mostly classic rock instrumental, with occasional song voice use.
Also pop/techno/trance as filler music works wonders.
No rap words, however maybe some rap instrumental.
Also this link for good sourcing of already succesful songs.