Crossword Genius

It’s a pleasure to write music on everything without tune ultimately (3,2,3)

Ross

I believe the answer is:

not at all

I'm a little stuck... Click here to teach me more about this clue!

'it's a pleasure to write music' is the definition.
I can't judge whether this defines the answer.

'on everything without tune ultimately' is the wordplay.
'on' says to put letters next to each other.
'everything' becomes 'all' (I've seen this before).
'without' becomes 'no'.
'tune ultimately' becomes 'tat' (I can't explain this - if you can you should believe this answer much more).
'no'+'tat'='notat'
'all' put after 'notat' is 'NOT AT ALL'.

Can you help me to learn more?

(Other definitions for not at all that I've seen before include "You're welcome" , "forget it" , "By no means - polite disclaimer" , "denial" , "My pleasure" .)

I've seen this clue in The Hindu.
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