The sine wave is the most basic and 
simple waveform. It doesn’t actually exist naturally, but we talk about it, draw it, and use it all of the time. A sine wave has only a fundamental and no harmonics. You may recognize it from warning tones and beeps. Listen to it here.
100hz Sine Wave
500hz Sine Wave
1000hz Sine Wave
Other Soundwave Examples:
Sine Wave – Square Wave – Sawtooth Wave – Triangle Wave
These main four waves can be seen in most synthesizers, DAWs, and testing equipment. There are some variations that include the sawtooth wave going in opposite directions and the lopsided square wave (being larger on the top and smaller on the bottom or vice versa). Depending on the device these waves can be added together to create complex waveforms, can be used to modulate a signal, or can create the pattern for a pulsating effect.
Click on the following to learn more about: Sound Waves and Harmonics
