Greek Modes for Guitar — Hijaz, Rebetiko & Laiko Scales in All 12 Keys (PDF)

194-page PDF + bonus cheat sheet: the 10 Greek modes (Hijaz, Ousak, Rast…) on guitar in all 12 keys, with chords, 49 progressions & 30 taximi phrases. Unique niche, little competition. 60% commission (~$16/sale).