Two notes, not the whole lot (4)

I believe the answer is:
some
'not the whole lot' is the definition.
I can't judge whether this defines the answer.
'two notes' is the wordplay.
'two notes' can mean two replacements for 'note'.
'note' becomes 'so' (musical note).
'note' becomes 'me' (alternative spelling the musical note mi).
'so'+'me'='SOME'
Can you help me to learn more?
(Other definitions for some that I've seen before include "certain" , "Unknown or unspecified amount or number" , "An undetermined number" , "An unspecified quantity, not all" , "Undefined number" .)
