What is a Maqam ?
In Arabic music, a maqam (plural maqamat) is a set of notes with traditions that define relationships between them, habitual patterns, and their melodic development. Maqamat are best defined and understood in the context of the rich Arabic music repertoire. The nearest equivalent in Western classical music would be a mode (e.g. Major, Minor, etc.)
The Arabic scales which maqamat are built from are not even-tempered, unlike the chromatic scale used in Western classical music. Instead, 5th notes are tuned based on the 3rd harmonic. The tuning of the remaining notes entirely depends on the maqam. The reasons for this tuning are probably historically based on string instruments like the oud. A side effect of not having even-tempered tuning is that the same note (by name) may have a slightly different pitch depending on which maqam it is played in.
What are Quarter Tones?
Many maqamat include notes that can be approximated with quarter tones (depicted using the half-flat sign or the half-sharp sign ), although they rarely are precise quarters falling exactly halfway between two semitones. Even notes depicted as semitones sometimes include microtonal subtleties depending on the maqam in which they are used. For this reason, when writing Arabic music using the Western notation system, there is an understanding that the exact tuning of each note might vary with each maqam and must be learned by ear.
Another peculiarity of maqamat is that the same note is not always played with the same exact pitch, the pitch may slightly vary depending on the melodic flow and what other notes are played before and after that note. The idea behind this effect is to round sharp corners in the melody by drawing the furthest notes nearer. This effect is sometimes called the law of attraction or gravity, and is common in other musical traditions (e.g. in Byzantine music).
By Sound4Sina Productions & Maqam World
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