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
Tabula Rasa (Pärt) "A," until in mm. 6, when the pattern reverses, and again the instrument sections are phased in, displaced by a half measure, but this time beginning with the lowest instrument pair (cello and contrabass). The string orchestra’s phasing pattern is reflected in the solo violin parts. When the orchestra is phasing in each part from highest pitch range to lowest, the solo violin plays an eighth note melody, when the solo bass line is played, the solo parts switch and play triplets, and when the chamber orchestra reverses the pattern and phase in again from the lowest pitch range to