Si 12 Bar Blues
I – I – I – I – IV – IV – I – I – V – IV – I – V progression in Si major
Si 12 Bar Blues — I – I – I – I – IV – IV – I – I – V – IV – I – V
The B 12-bar blues (B – B – B – B – E – E – B – B – F# – E – B – F#) 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 (BMaj7 – BMaj7 – BMaj7 – BMaj7 – EMaj7 – EMaj7 – BMaj7 – BMaj7 – F#7 – EMaj7 – BMaj7 – F#7), the raw blues character comes fully alive.
Playing in Si major
B major mixes barre and open elements. The B chord itself is a barre at fret 2, but E and A are comfortable open chords forming the IV and V. The open B string rings as the root, allowing creative drone-based arrangements. B is a intermediate-level key on guitar because the open B string rings as the root and the open E strings provide the 4th — useful for sus4 voicings and drone effects. This key mixes open and barre shapes, making it a good intermediate challenge that builds fretboard fluency.
Voice Leading
The bass line moves through B to B (ascending unison), B to B (ascending unison), B to B (ascending unison), B to E (ascending perfect fourth), E to E (ascending unison), E to B (descending perfect fourth), B to B (ascending unison), B to F# (descending perfect fourth), F# to E (descending whole step), E to B (descending perfect fourth), B to F# (descending perfect fourth). The predominantly stepwise bass motion creates smooth, connected voice leading. When the progression loops, the bass returns from F# to B by perfect fourth.
Capo Transposition
To play in B using familiar open chords: capo 2 with open A shapes; capo 4 with open G shapes; capo 7 with open E 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
B 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, B 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.