Sikah is a maqam rich in quarter tones: in the version on this site five of its seven degrees are shifted by a quarter tone. It is worth practicing with a drone and a tuner, to hear and check every note against the tonic.
Choose an instrument and a root above to see Sikah on the fretboard.
Note: a regular flat (like E♭) is a semitone, so it is blue. Only a half-flat (↓, e.g. E↓ or B↓) is a quarter tone, shown in yellow. Each quarter tone is drawn inside the fret box above it, and if that box also holds a regular note, both are shown side by side. Play it by bending the string or on a fretless guitar.
Degrees: 1 - ½b2 - ½b3 - ½#4 - 5 - ½b6 - ½b7
Notes on D: D E↓ F♯↓ A♭↓ A B↓ D♭↓
Notes on C: C D↓ E↓ F♯↓ G A↓ B↓
In maqam Sikah the quarter tones are on degrees 2, 3, 4, 6, 7. On D these notes are E↓, F♯↓, A♭↓, B↓, D♭↓. On the fretboard they are marked in yellow, and the symbol ↓ marks a note lowered by a quarter tone (half-flat).