One frequently downcast in company of master classical musician (2-2,2)

'one frequently downcast in company' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'master classical musician' is the wordplay.
I cannot really understand how this works, but
'master' could be 'ma' (Master of Arts) and 'ma' is present in the answer.
The remaining letters 'yoyo' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?