Be aware that this project can not be done with just an Arduino Uno. Also it is a complex processor intensive project, it might sound simple to you but that is because you have no idea yet about what is needed.
I would advise you to look at the Teensy 3.6 board and the I2S sound output board they sell. They have developed a graphics interface for complex projects like this.
https://www.pjrc.com/store/teensy36.html
This page tells you about it in the long video
https://www.pjrc.com/store/audio_tutorial_kit.html