The Chord That Goes Everywhere | Diminished 7th Explained

Learn the diminished 7th chord on piano with Jason Zac of Nathaniel School of Music — resolutions, drills and the three-chord family. The diminished 7th chord is arguably the most powerful chord in music — one shape with endless resolutions. In this piano tutorial we break down its theory and turn it into two practical drills you can play today. We start with the formation: a diminished 7th is minor thirds stacked on top of each other, so every inversion is another diminished 7th. That means only three of them exist across all 12 keys — B/D/F/Ab are one family, and you move up chromatically for the rest. We also separate it from the minor seventh flat five (the ii chord in a 2-5-1 minor). Then we explore the leading-tone diminished cadence: B diminished 7th resolving to C major and to A minor (its relative minor), giving you many destinations from one source. You'll see how the same shape works as a rootless dominant, turning into E7♭9, Bb7♭9, G7♭9 and Db7♭9 — four chords from one diminished 7th. Drill one climbs up (dominant 7 → diminished 7 → major or minor); drill two climbs down (diminished 7 → dominant 7 → resolution). Ideal for pianists who know major and minor chords and want a versatile harmonic tool. 🏫 Courses, Workshops or Private lessons ➡️ https://forms.gle/fsbhFKSgJbZ5xZEr8 ============================= 📹 Our Video Courses (Everything for Life Bundle) - https://learn-music.nathanielschool.com/ 🏡 Visit our Channel for more Tutorials & Performances - https://geni.us/NathanielYouTube ============================= ▶️ Related Videos & Playlists 📂 Cadences & Chord Progressions - https://www.youtube.com/playlist?list=PLrNNL05e9FT_sKjWd1c7K_S55cZ15jAKI 📚 Mysterious Chord Connections - https://www.youtube.com/playlist?list=PLrNNL05e9FT9bd7fnB4zMsgobcFj52N31 🗂️ Jazz Lessons - Chords, Standards & Exercises - https://www.youtube.com/playlist?list=PLrNNL05e9FT9ZCriHyNonJasffWWSCS_E 📋 Chord Voicing & Inversions - https://www.youtube.com/playlist?list=PLrNNL05e9FT9ygtrGwGFmfyvMyGWH52EC 🎶 My Favourite Chords of All Time - https://www.youtube.com/playlist?list=PLrNNL05e9FT_BXqRCVauDnJH7oHhIv-z7 ============================= 🎓 Learn Music With Nathaniel School of Music & Jason Zac: https://nathanielschool.com 📚 All our YouTube lessons (1000+) categorised by skill level, topic & genre all in one place: https://free-music-lessons.nathanielschool.com ⏳ Chapter markers 00:00 - What Is the Most Powerful Chord? 🎹 00:15 - Meet the Diminished 7th Chord 00:33 - Diminished 7th vs Minor 7th Flat 5 00:42 - One Shape, Endless Resolutions 01:11 - The Goal: Two Practice Drills 01:46 - Formation: Stacking Minor Thirds 01:55 - B Diminished 7th Broken Down 02:17 - The B/D/F/Ab Family 02:34 - Building All 12 Chromatically 03:10 - Voicing in the Top Register 03:18 - E Becomes E7♭9 🎶 03:54 - Write It Down and Play Along 04:09 - A Supporting App for Practic 04:22 - Resolving B°7 to C Major 05:10 - Resolving to the Relative Minor 05:30 - One Source, Many Destinations 05:42 - Cycling Through a Melody 06:25 - Leading Tone Diminished Cadence 06:33 - D°7 = B°7: Same Notes 06:59 - Resolving to Eb Major & C Minor 07:28 - G# Diminished 7th, Same Four Cousins 07:55 - It Spreads Like a Virus 🔥 08:06 - Drill 1: Climbing Up 08:25 - Starting from Bb7 08:34 - Move the Root Up a Half Step 09:05 - Trying It on C7 09:39 - Drill 2: Climbing Down 10:19 - C°7 → B7 → E Major or Minor 10:40 - Chords Beyond the Scale 11:13 - Barry Harris & Diminished Scales 11:35 - Recap: Three Ways to Use It 12:19 - Requests & App Access 💰 Donate on PayPal: https://geni.us/DonatePayPal 👨‍👩‍👧‍👦 Follow me on Instagram: https://instagram.com/jasonzac 📞 Call +91 98454 65411 · 💬 WhatsApp chat +91 77604 56847 📧 Customised & Private Classes: music@nathanielschool.com 🎧 Listen to Jason Zac Music: https://riffs.jasonzacmusic.com/ #Diminished7th #DiminishedChords #PianoChords