Pop group's off-and-on samba beat (4)

I believe the answer is:

abba

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This clue could be a double definition.

'pop group's' is the first definition.
(Swedish pop band)

'off-and-on samba beat' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for abba that I've seen before include "6 24 113 [SCAN-DIN-AVIAN] band" , "They used to record" , "Palindromic 70s pop group" , "Waterloo singers" , "Bishop" .)

I've seen this clue in the Sydney Morning Herald.

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