Do 12 Bar Blues
I – I – I – I – IV – IV – I – I – V – IV – I – V progression in Do major
Do 12 Bar Blues — I – I – I – I – IV – IV – I – I – V – IV – I – V
The C 12-bar blues (C – C – C – C – F – F – C – C – G – F – C – G) is the bedrock of blues, rock, and jazz — twelve bars, three chords, infinite expression. Combine the Minor Blues scale with Major Pentatonic for the classic note-bending vocabulary that defines the genre. Mixolydian fills in the gaps between pentatonic positions with diatonic color. With dominant seventh voicings (CMaj7 – CMaj7 – CMaj7 – CMaj7 – FMaj7 – FMaj7 – CMaj7 – CMaj7 – G7 – FMaj7 – CMaj7 – G7), the raw blues character comes fully alive.
Playing in Do major
With no sharps or flats, C major is the theoretical home base on guitar. The open G, B, and high E strings all belong to the C major chord, creating natural sustain. C is a beginner-level key on guitar because the open B and high E strings ring within the scale, and every basic chord uses familiar open shapes. Beginners will find this key approachable since most chords use open voicings with minimal stretching.
Voice Leading
The bass line moves through C to C (ascending unison), C to C (ascending unison), C to C (ascending unison), C to F (ascending perfect fourth), F to F (ascending unison), F to C (descending perfect fourth), C to C (ascending unison), C to G (descending perfect fourth), G to F (descending whole step), F to C (descending perfect fourth), C to G (descending perfect fourth). The predominantly stepwise bass motion creates smooth, connected voice leading. When the progression loops, the bass returns from G to C by perfect fourth.
Capo Transposition
To play in C using familiar open chords: capo 3 with open A shapes; capo 5 with open G shapes. Choose the capo position that gives you the voicings you prefer — lower capo positions produce a fuller sound, while higher positions create a brighter, mandolin-like timbre.
Scales for Soloing
C major pentatonic works because every note is either a chord tone or a safe passing tone — there are no avoid notes. For soloing, this means you can play freely without clashing. Over dominant seventh chords, C Mixolydian adds the flat seventh for an authentic blues-rock edge.
Strumming Pattern
Use a shuffle pattern: D-u-D-u with swung eighth notes at 80-120 BPM. The triplet feel is essential — think of each beat divided into three, skipping the middle note. Add palm muting on the bass strings for a tighter groove.