Si Alegrías
I – V7 – I – IV – I – V7 – I progression in Si major
Si Alegrías — I – V7 – I – IV – I – V7 – I
Joyful flamenco palo from Cadiz in major mode. Unlike most flamenco which uses the Phrygian mode, Alegrias lives in pure major tonality (typically E major). The 12-beat ternary cycle with accents on 3, 6, 8, 10, 12 shares the solea family rhythmic structure but with a bright, celebratory character.
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 F# (descending perfect fourth), F# to B (ascending perfect fourth), B to E (ascending perfect fourth), E to B (descending perfect fourth), B to F# (descending perfect fourth), F# to B (ascending perfect fourth). The root motion by larger intervals (fourths and fifths) gives each chord change a strong, decisive character. When the progression loops, the bass returns from B to B by unison.
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
Try a D-D-DU waltz pattern at 80-100 BPM. Accent beat 1 strongly and keep beats 2-3 lighter. For fingerpicking, use a bass-pluck-pluck pattern with alternating bass notes.