It helps to set the mood in country, perhaps, with history (10,5)
I believe the answer is:
background music
'it helps to set the mood' is the definition.
The definition suggests a singular noun which matches the answer.
'country perhaps with history' is the wordplay.
'country perhaps' becomes 'music' (I can't explain this - if you can you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'history' becomes 'background' (I've seen this before).
'music' put after 'background' is 'BACKGROUND MUSIC'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for background music that I've seen before include "atmospheric enhancement" , "Muzak" .)