It depends on the ending. singulars: Boston, Metallica, Coldplay, and The Who plurals: Alice in Chain s and The Beatle s
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HalfMoonsingulars: Boston, Metallica, Coldplay, and The WhoIn AmE, yes, but speakers of BrE would treat them as plural.
HalfMoonplurals: Alice in ChainsThat would be singular in AmE.