I am so sorry to tell you that, I didn't know why Google play charged me for this App Subscription? I want to learn Guitar, just look around to look for the best suits me. I also download your app but I totally have not any decision to buy it yet because I was still on the way to looking. Then, I deleted the App because I read the comment of Oscar Salazar on March 4. Google Play charged me on that day, I didn't know that until I checked my account yesterday. I contacted to Google Play and they said that "It can not refund?" That was my bad experience about the services and even the risk that the customers have to struggle. If you have time, I really want to hear your feedback. Thank you