Two G notes and three D notes on open strings form a thick, overtone-rich chord — warm, with a characteristic "earthy" timbre. Slide guitar in Open G sounds distinctive: this timbre is associated with delta blues and classic rock 'n' roll. On acoustic, the tuning delivers a spacious sound with long sustain.
Barre at any fret = major chord; raise the third (B) by a semitone = minor. Keys of G, C, D sound especially full: open strings resonate with fretted notes. Keith Richards removed the 6th string and played on five, discovering a whole world of raw rock 'n' roll voicings. Power chords sit on any two adjacent strings — simple and powerful.
The G major pentatonic lays out conveniently across the fretboard — many notes coincide with open strings. Blues licks with bends and slides sound rich and full. Melody on the 1st string D over open bass G and D creates the effect of two instruments playing simultaneously.
Minor keys are harder to work with than major: the third must be "corrected" in each chord. Keys far from G — Ab, Eb — sound dull and are fingering-awkward. The tuning is optimized for blues, rock, and country; for jazz extensions or classical repertoire it's limited.
Right-hand skills, rhythmic sense, and ear training transfer completely. From the left hand — almost nothing: fingerings, scale boxes, and the fretboard note map are different. But a fundamentally new logic emerges: "barre = chord," turning slide playing into something intuitive and immediate.
Slide (bottleneck) is the tuning's signature technique: gliding between fret-chords, slide vibrato. One-finger barre for rhythmic chords. Open D and G drones as rhythmic pulse. Blues bends on the 3rd string (B → C) — a characteristic move.
Slide a barre (or bottleneck) up all frets — hear how each fret sounds like a major chord. That's your first lesson. Then learn to make minor by raising B (3rd string) a semitone. A bottleneck slide is a straightforward way to start playing in Open G.
Play a 12-bar blues: G on open strings, C at the 5th fret, D at the 7th — the entire cycle with a slide. Add single-note blues phrases between chord changes. Try Keith Richards' five-string approach: remove the 6th string and play open, punchy riffs.
Memorize chord landmarks: open = G major, 5th fret = C major, 7th = D major, 12th = G an octave higher. These four points are your skeleton. Learn individual string notes later, once the "chord map" is in your fingers.
Listen to Rolling Stones "Start Me Up" and "Brown Sugar," Robert Johnson "Cross Road Blues," Ry Cooder — three facets of Open G. Start with a 12-bar blues in G: the minimum set that immediately sounds convincing.