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Is it legal for a piano shop to sell it to class?

Legal. Selling piano in a musical instrument store is a kind of business promotion, which means that when you buy a musical instrument in a musical instrument store, the business will give you some extra class hours or courses. The purpose of this promotion is to attract customers to buy musical instruments and provide free courses to help customers start learning or further improve their musical skills. The musical instrument store will determine the number of hours given away according to the type, price and brand of the musical instrument you buy. It is legal for the musical instrument store to give away hours as a promotional activity, which is just a marketing strategy adopted by the merchants to attract customers and promote sales.