About the music, don't give vent to your feelings (8)
I believe the answer is:
restrain
'don't give vent to your feelings' is the definition.
I can't tell whether this definition defines the answer.
'about the music' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'the music' becomes 'strain' (strain is a kind of music).
're'+'strain'='RESTRAIN'
Can you help me to learn more?
(Other definitions for restrain that I've seen before include "Prevent (from excess)" , "Control - check" , "Keep back" , "Limit" , "Stop" .)