Syrian Cantors

The Syrian Cantor or "hazzan" leads the traditional prayer rituals in the synagogues of the Syrian Jews. He conducts the services using ten maqamat or musical modes. A cantor must be fully cognizant of these maqamat and their applications to the prayers. A different maqam is used each week, depending on the week's Torah portion. 
Maqamat.
The maqam system is characteristic of, and can be used to classify, all Arabic music.
The term "maqam" has various shades of meaning. On the most basic level, a maqam is a musical scale. A few of these consist of steps of a whole tone and half a tone in the same way as the Western diatonic scale. Others also admit steps of one and a half tones, like the Western harmonic minor and the "steiger" of Ashkenazic cantorial practice. The majority include one or more three-quarter tone steps, this being the distinguishing characteristic of Arabic and other Middle Eastern music. 
In addition to the scale used, each "maqam" has different conventions governing which note of the scale predominates, which note a melody must end on and the characteristic melodic turns of phrase; thus there can be two or more maqamat using the same basic scale. Each maqam has a different flavor or mood, which is meant to provoke certain moods, thoughts, and emotions. Due to that fact and the myriad of possible combinations, there are over one hundred maqamat, each named after its supposed city or region of origin in the Middle East. (This may be compared with the geographical terms such as "Dorian" and "Phrygian" used for the modes in ancient Greek music.) Approximately ten of these "maqamat" are in widespread use in the Syrian Jewish community.
In yet another meaning, "maqam" can be used for an improvised instrumental cadenza using a given musical mode (the vocal equivalent is called a "mawwal", and is used for the "petiħot" interspersing the baqashot service).
Maqam of the week.
Each week in the Hebrew calendar is associated with a particular maqam, usually governed by the Torah portion for that week. There are also maqamat associated with the Jewish festivals.
Certain maqamat are associated with certain themes. Therefore, the cantor must be aware of the themes in the weekly Torah portion in order to apply the proper maqam on that Shabbat. The choice of maqam for a given Shabbat is determined by the subject matter of the Torah portion and is set forth in an index of the pizmonim book. Numerous lists have been compiled over the last one hundred and fifty years designating the maqam for each parasha. Occasionally the lists conflict with each other (for example, when two portions are read on the same Sabbath), but most of the time the underlying pattern is evident. 
Application of the weekly maqam.
In a Shabbat or festival service, the maqam is relevant for three purposes:
Exceptions to the use of the weekly maqam.
Regardless of the maqam for the week or festival: 
Weekday services also are not recited according to the maqam of the week.
Notable cantors.
The following were or are well-known cantors in the Syrian Jewish communities of Israel and the United States.