These substitutions keep the blues "feel" (blue notes, swing) while adding jazz sophistication. The YouTube Short you shared demonstrates exactly this—extended/jazz chords over the 12-bar form for richer harmony. Experiment and transcribe players like Charlie Parker, Count Basie, or Joe Pass for real-world application!azz blues substitutions transform the simple, repetitive 12-bar blues (I–IV–V dominant chords) into a harmonically richer form full of ii–V movements, chromatic motion, tritone subs, diminished chords, and turnarounds. This creates the sophisticated sound heard in bebop, swing, and modern jazz.jazzguitar.beBasic 12-Bar Blues (in F, a common jazz key)Bar123456789101112ChordF7F7F7F7Bb7Bb7F7F7C7Bb7F7C7This uses only three dominant 7th chords. Jazz players expand it with extensions (9ths, 13ths, alterations) and substitutions.jazzguitar.bejenslarsen.nllearnjazzstandards.comCommon Jazz Blues Substitutions Quick Change / Early IV (1930s style): Move to IV7 in bar 2 for forward motion. Example in F: Bar 2 becomes Bb7, then back to F7 in bar 3.jazzguitar.be ii–V Insertions: Replace or precede dominant chords with minor 7 → dominant 7 (ii–V) for smoother voice leading.Bar 4: Cm7–F7 (ii–V of Bb7). Bars 9–10: Often Gm7–C7 (ii–V of F).music.stackexchange.com #IVdim7 (Count Basie style): In bars 2 and/or 6, insert Bdim7 (or equivalent) for tension and chromaticism. It acts as a passing chord or V7b9 substitute.jazzguitar.be Secondary Dominants: Use V-of-V (or further) for chains like D7–G7–C7. This builds momentum, especially in turnarounds.music.stackexcha… Tritone Substitution (bII7 for V7): Replace any dominant 7 with the dominant a tritone away. They share the same 3rd and 7th (guide tones), creating strong resolution via half-step bass motion.G7 → Db7 (tritone sub). Common in bar 4 (before IV), turnarounds, or descending dominants (e.g., F7–E7–Eb7–D7). This is a hallmark of jazz blues for chromatic lines and altered sounds.jazzguitar.bepianogro… Turnarounds (Bars 11–12): Instead of V7–I or straight V–IV–I, use:iii–VI–ii–V (e.g., Am7–D7–Gm7–C7). I–VI–ii–V (F7–D7–Gm7–C7). Tritone or diminished versions for variety. These lead back smoothly to bar 1.learnjazzstandards.comBebop/Bird Blues (e.g., "Blues for Alice") layers multiple ii–Vs, tritone subs, and iii–VI–ii–V for dense, fast-moving harmony.jazzguitar.bePractical TipsVoicings: Use rootless 3-string or 4-note voicings (e.g., 3-7-9-13) for comping. Add alterations (#9, b13) on dominants for tension. Improvisation: Target guide tones (3rd/7th) and use the blues scale Mixolydian altered scales over subs. Practice: Start with basic changes, then layer one substitution at a time. Play along with backing tracks in F, Bb, or C.