Unauthorized purchase
I received an email thanking me for a purchase of Magic Piano by Smule got $21.76 that I did I not purchase.
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If the only indication of the charges is from an email or text, be aware that it may be a phishing attempt to get you to log in to a site that appears to be Apple and divulge your password or credit card information. See: Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support
and Identify legitimate emails from the App Store or iTunes Store - Apple Support
You can use the following instructions to determine if it is a real charge, what it is for, and to report a problem: Request a refund for an App Store or iTunes Store purchase - Apple Support
Also see: If you see 'itunes.com/bill' or an unfamiliar charge on your statement - Apple Support