Oud later), tuned in successive fourths. Curt Sachs said they were called (from lowest to highest pitch) "bamm", "maṭlaṭ", "maṭnā" and "zīr". "As early as the ninth century" a fifth string "ḥād" ("sharp") was sometimes added "to make the range of two octaves complete". It was highest in pitch, placed lowest in its positioning in relation to other strings. Modern tuning preserves the ancient succession of fourths, with adjunctions (lowest or highest courses) which may be tuned differently following regional or personal preferences. Sachs gives one tuning for this arrangement of five pairs of strings, d, e, a, d', g'. Historical
Violin family have four strings each, are tuned in fifths (except the double bass, which is tuned in fourths), are not fretted and have four rounded bouts while always having a sound post and bass bar inside. In contrast, the viol family instruments usually have five to six strings with a fretted fingerboard, are tuned in fourths and thirds, often have sloping shoulders, and do not necessarily have a sound post or bass bar. The instruments of the violin family are the most used bowed string instruments in the world today. Although all share a place in classical music, they are also