Anyone who gets started in electronics with Arduino is probably going to learn to blink an LED. A few years down the line, I still like blinking LEDs! I’ve also discovered various ways to create sounds on chip, including the tone() function, resistor ladders, and the MOZZI synth library (which is worth checking out). Of course, blinking lights, and making sounds at the same time is even better. But what if I could program a drum beat, synchronize a light to it, and then play a tone on top of it without even using buttons? THAT would be pretty cool!