Electric Bass: F# Persian Over the Changes
Where F# Persian lies at this seat, and what a chorus takes out of it.
F# Persian runs 7 notes to the octave, laid out here on EADG with every F# flagged. Mid-chorus the pattern is not what you need; where the root is when the chord changes underneath you is.
Intensely exotic — two half-step clusters (b2 against the root, b5 against the 4) and a raised 7th make it the most dramatic of the world scales. Mysterious, ornate, and tense.
Heard in: Persian and Middle-Eastern-flavored melodies, film scoring for desert and ancient settings, and exotic metal and progressive-rock riffs.
The electric bass can hold a note long enough for it to be heard as a choice rather than a step, so a scale here is read for its strong tones first and its passing tones second.
Play it slowly against the audio until it stops being a shape, then put it over two bars of a form and let the chord tones decide which of the notes you actually keep.