com with: "band is playing" and "band are playing" (quotation marks are important) and draw your own conclusions
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MrPedanticHello Magda
In BrE, you might find either. "Has" presents the band as a single entity; "have" as a collection of entities. I would myself say "have", as "playing together" implies more than one entity; but other speakers would disagree.
In other cases (in BrE, at least), it's sometimes clearer:
1. The band was formed in 1990.