Music instrument as an expense, which category

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Thank you for the detailed explanation. Since it is a second-hand instrument with a new price of 500 that I bought for 220 from a private person, I have placed it in a new category under "general expenses/small performance equipment", 50% professional expense, because I also use the instrument privately. This seems most correct to me. Please feel free to respond, or you may choose to respond later or to close my question in a few weeks.