Ever heard of “Sus” in music and not sure what it means? In this online piano lesson, I explain exactly what a sus chord is including Sus2 and Sus4. The music theory behind this has to do with understanding the breakdown of a piano chord of a root 3rd and 5th. Sus means suspension to suspend the 3rd from occurring by using the 2nd or 4th of the scale instead. This piano tutorial will help you understand music theory and chords better and easier by showing you how to play and practice sus chords