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Hi Margaret, you can retune your harp to 440hz without any problem, it won’t hurt your harp 🙂 It may be easier to play with other instruments, but I think that depends where you are located. As far as I know, 442 is more an american norm, since 440 is the european (or international!) standard (please US people tell me if I’m wrong…). Some US orchestras even play in 444, that comes from classical pianists who tends to like a brighter (higher) sound. There is also a big question about 432hz which would be, for some people, more ‘natural’, with some of mystic vibration (I didn’t try yet)