Meaning
A huge hit song — a track that everybody loves, that locks the dance and rules the airwaves. A 'big tune' (or 'big chune') gets the 'wheel an come again' and the gun-finger salute; calling something 'a big tune!' is high praise. The variant 'boom tune' says the same with an extra bang.
Examples
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Dat a big tune, everybody a sing it.
That's a big hit; everybody's singing it.
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Him drop a big chune fi di summer.
He dropped a big hit for the summer.
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Big tune! Wheel it up!
Big hit! Rewind it!
Origin
From 'big' + 'tune' (chune); a hit song. See [[wheel-and-come-again]], [[crossover]].
How it’s used
A hit song ('big chune'/'boom tune'); high praise. See [[wheel-and-come-again]], [[crossover]].