The classical cadence is the most important subject to understand music and how chords move or just how music works in general. There are several expression for the classical cadence. Some call it the I IV V progression, some the L Form and some Tonica, Subdominat and Dominat. But the main thing is that it represents a principle which you find in mostly all music genres which have the focus on musical expression. And the principle is that a chord progression starts with a Resting Point ( Tonica, I, Root ) then Build up Tension ( Sub Dominat, IV ) goes to a Maximum Tension ( Dominant, V ) to get back to the Resting Point. This works in all major and all minor keys the same. Below you find all chapters of this tutorial.
0:00 Introduction
1:17 The L-Form
2:04 Major
4:39 Minor
7:30 Inversions
Classical Cadenza.gp
Classical Cadenza.pdf