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音高(pitch):簡單講就係一吓聲聽落有幾「高」,喺現代聲學上係指吓聲嘅頻率有幾高,頻率愈高就音高愈高;喺現代音樂上,一般會將音樂上會用到嘅音高俾啲名佢哋,例如中 C 就係啲人學彈鋼琴通常第一吓會彈嘅聲,係指頻率 261.626 Hz 左右[註 1]嘅聲,而如果話兩吓聲「相距一個八度」,意思係指高啲嗰吓聲嘅頻率大約啱啱好係低啲嗰吓聲嘅兩倍咁多[16]。以下係基本 C 大調嗰啲音高喺五線譜入面嘅樣:
呢段聲係用鋼琴將 C 大調嘅音符由低至高彈出嚟,彈到最高再由高至低彈多次;圖中嗰兩個 C 之間相距一個八度。
↑Some definitions of opera: "dramatic performance or composition of which music is an essential part, branch of art concerned with this" (Concise Oxford English Dictionary); "any dramatic work that can be sung (or at times declaimed or spoken) in a place for performance, set to original music for singers (usually in costume) and instrumentalists" (Amanda Holden, Viking Opera Guide); "musical work for the stage with singing characters, originated in early years of 17th century" (Pears' Cyclopaedia, 1983 ed.).
↑Cooke, Mervyn (2005). The Cambridge Companion to Twentieth-Century Opera. Cambridge: Cambridge University Press.