An (almost) octave of an organ keyboard, the twelve notes of the dodecaphonic scale. Drawn in Inkscape. 風琴鍵盤 dodecaphony、General、instrument、keyboard、keys、music、octave、organ、piano dodecaphony、一般、儀器、鍵盤、按鍵、音樂、八度、器官、計劃 資料來源：openclipart ( https://openclipart.org/ )
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