The Magic of ii–V–I: Why Jazz Doesn’t Need to Be Hard (Live Ukulele Lesson) Jazz often has a reputation for being complicated, intimidating, or “only for advanced musicians”. But the truth is, much of jazz harmony is built on a few beautifully simple ideas — and once you understand them, everything starts to make sense. One of the most important of these ideas is the ii–V–I chord progression . If you’ve ever been told “ii–V–I sounds great”  but never really shown why , you’re