“Iranian classical singing” (“avaz” in Persian) contains the ornament called a tahrir. It typically is a sequence of tekyeh fundamental frequency gestures that quickly increase and then decrease. The primary aim was to determine and describe the tahrir patterns produced by a professional avaz singer. An unaccompanied recording was made of a professional avaz singer singing the popular song “Morghe Sahar” (“Dawn Bird”). Consistent patterns of tahrir productions were determined after repeated listening. Four primary tahrir patterns were identified, based on (1) the number of tekyehs within the tahrir, (2) fundamental frequency extent from the baseline to the tekyeh peaks, and (3) inter-tekyeh interval durations. Pattern 1 consists of one tekyeh and is called a “zinat.” Pattern 2 is a multiple tekyeh gesture with relatively long inter-tekyeh intervals. Pattern 3 is a multiple tekyeh gesture with relatively short inter-tekyeh intervals. Pattern 4 is a vibrato-like pattern with multiple tekyehs with short inter-tekyeh intervals like Pattern 3 but with relatively short frequency extents. The results are pertinent to voice scientists interested in the mechanics of phonatory production, to singing teachers and artists interested in pedagogy based on acoustic and perceptual information, and to ethnomusicologists interested in cultural musical performance and production.