![Learning piano using the simply piano app. I've noticed this in a lot of piano sheets. What does the flat symbols and the 3 and 4 mean? Usually I see them right Learning piano using the simply piano app. I've noticed this in a lot of piano sheets. What does the flat symbols and the 3 and 4 mean? Usually I see them right](https://i.redd.it/2d2wavc9he7a1.jpg)
Learning piano using the simply piano app. I've noticed this in a lot of piano sheets. What does the flat symbols and the 3 and 4 mean? Usually I see them right
![Introducing Simply Piano for Android - Learn to Play an Instrument with step-by-step lessons | Simply Blog Introducing Simply Piano for Android - Learn to Play an Instrument with step-by-step lessons | Simply Blog](https://joytunes.com/blog//blog/wp-content/uploads/2017/02/Screenshot_20170222-104527-576x360.png)
Introducing Simply Piano for Android - Learn to Play an Instrument with step-by-step lessons | Simply Blog
![A look under-the-hood of Simply Piano (Part 2) | by Yoni Tsafir | Simply (formerly JoyTunes) | Medium A look under-the-hood of Simply Piano (Part 2) | by Yoni Tsafir | Simply (formerly JoyTunes) | Medium](https://miro.medium.com/v2/resize:fit:4416/1*pgR9xvbgKeasL6ZXAJNavg.png)