Blink Without Delay | Arduino Documentation | Arduino Documentation
Use tone() with Arduino for an Easy Way to Make Noise - Programming Electronics Academy
Technoblogy - A Lightweight Alternative to tone
GitHub - PaulStoffregen/MusicWithoutDelay-LIbrary: A User-friendly Arduino Library that allows Music(chiptunes) to be played without delay. No shields needed(Just a speaker).
HOW TO USE MILLIS INSTEAD OF DELAY IN ARDUINO - YouTube
Arduino tone generator
Interface Buzzer With Arduino Uno - Hackster.io
Playing a Scale | Arduino Lesson 10. Making Sounds | Adafruit Learning System