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In March 2007, iTunes 7.1 added support for Windows Vista, and 7.3.2 was the last Windows 2000 version. Until January 16, 2008 with the 7.6 update, iTunes lacked support for 64-bit versions of Windows. iTunes is currently supported under any 64-bit version of Windows, although the iTunes executable was still 32-bit until version 12.1.
12-tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. 12 equal temperament (12-ET) is the musical system that divides the octave into 12 parts, all of which are equally tempered (equally spaced) on a logarithmic scale, with a ratio equal to the 12th root of 2 (12 √ 2 ≈ 1.05946).