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Oh, I hadn't thought of "a company selling musical instruments and related items"! I was thinking "voice" (in the context of a conservatory), but a music store is probably dealing with "songs." So IMO, context still matters. ;-)
So far, there are three answers – all possible, in one context or another. What's your context, please? Is it a music school, a nursery school, a camp, a marching bank (not likely, with claviers, but I'm hardly ever sure of anything anymore), etc. Thanks in advance! :-)