The eighth note, or octave, is given the same name as the first, but has double its frequency. In traditional Indian music, musical notes are called svaras and commonly represented using the seven notes, Sa, Re, Ga, Ma, Pa, Dha and Ni. Several European countries, including Germany, adopt an almost identical notation, in which H is substituted for B (see below for details). However, in English- and Dutch-speaking regions, pitch classes are typically represented by the first seven letters of the Latin alphabet (A, B, C, D, E, F and G). In European music theory, most countries use the solfège naming convention do–re–mi–fa–sol–la–si, including for instance Italy, Portugal, Spain, France, Romania, most Latin American countries, Greece, Albania, Bulgaria, Turkey, Russia, Arabic-speaking and Persian-speaking countries. Because of that, all notes with these kinds of relations can be grouped under the same pitch class. ![]() Two notes with fundamental frequencies in a ratio equal to any integer power of two (e.g., half, twice, or four times) are perceived as very similar.
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