Chance briefly to catch very loud bits of tune (5)

'bits of tune' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'chance briefly to catch very loud' is the wordplay.
'chance briefly' becomes 'ris' (I can't explain this - if you can you should believe this answer much more).
'to catch' indicates putting letters inside.
'very loud' becomes 'ff' (musical abbreviation).
'ris' going around 'ff' is 'RIFFS'.

Can you help me to learn more?