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Title: Don't Buy for Music Block
Review: I'll keep this short - if you have the large Neurosmith music block toy, this cartridge DOES NOT work in that particular toy. I think it is to be used in another Neurosmith product. My daughter now uses the cartridge as a giant plastic thing-a-ma-doo. Basically, we don't use it. I paid $5 for it, so no big deal. Just beware that it appears not all cartridges are interchangeable.
