hello everyone , in this tutorial I will show you how to build a RTTTL player ,and I will show you how to do that using Teensy 3.1 .You can expand the number of the songs you want to add , and will show you how to do that later and give you a resources for more than 10K files.first , let’s talk a look for what we need : Teensy 3.1 MCU board. 8 ohm speaker Nokia 5110 PCD8544 LCD Button * 2 pcs potentiometer jumpers(female-male and male-male) resistor 2.2K mini breadboard DC power jack 2.1mm. drill. Something to hold everything inside , I used Pringles can as the only choice I had”