Uber famous band. Can you solve?!

Question: Uber famous band!. Can you solve!?

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interesting oddity : only two letters in this four letter band's name
certainly one of the wealthiest bands in historyWww@Enter-QA@Com

Answers:

ABBAWww@Enter-QA@Com

ABBA!! :]] haha im soo awesome!.!. :]]Www@Enter-QA@Com

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