Triple key note goes on and on (4,4,4)

I believe the answer is:

blah blah blah

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'on and on' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'triple key note' is the wordplay.
'triple' becomes 'blahblah' (I can't justify this - if you can you should give a lot more credence to this answer).
'key' becomes 'b' (eg B major, musical key).
'note' becomes 'lah' (I've seen this before).
'blahblah'+'b'+'lah'='BLAH-BLAH-BLAH'

'goes' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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