Mandolin are used. Usually, courses of 2 adjacent strings are tuned in unison. By far the most common tuning is the same as violin tuning, in scientific pitch notation G–D–A–E, or in Helmholtz pitch notation: g–d′–a′–e″. Note that the numbers of Hz shown above assume a 440 Hz A, standard in most parts of the western world. Some players use an A up to 10 Hz above or below a 440, mainly outside the United States. Other tunings exist, including "cross-tunings", in which the usually doubled string runs are tuned to different pitches. Additionally, guitarists may sometimes tune a mandolin to
String Quartet No. 6 (Babbitt) one instrument at a time, are used to mark off composite pitch aggregates . The work is based on an all-partition array which is (with a few swapped partitions) the M5 transform of the one used in "The Joy of More Sextets" (1986), for violin and piano . String Quartet No. 6 (Babbitt) String Quartet No. 6 is the last of six chamber-music works in the string quartet medium by the American composer Milton Babbitt. Babbitt’s expansive and lyrical Sixth Quartet was written in 1993. It is in two sections, in each of which the work's underlying six-part all-partition array