A3 A2 • D4 D4 D3 • G4 G3 • B3 B3 • E4 E4 The 18-string 6-course instrument has six triple-strung courses, tuned as follows: E3 E3 E2 • A3 A3 A2 • D4 D4 D3 • G4 G4 G3 • B3 B3 B3 • E4 E4 E4 The 18-string 7 course instrument features: four triple-strung bass courses and three double-strung treble courses. It is tuned as follows: C3 C3 C2 • E3 E3 E2 • A3 A3 A2 • D4 D4 D3 • G4 G3 • B3 B3 • E4 E4 Note that the lowest pitched (7th) course is frequently tuned to pitches other than 'C', at the player's discretion, to accommodate the music. The tuning to C is common, but not standard. References Notes Sources The Stringed Instrument Database ATLAS of Plucked Instruments String instruments Portuguese musical instruments Azorean culture pt:Violas portuguesas