music history & literature
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DESCRIPTIONMusic History & Literature. Musical Systems November 18, 2008 Presented by Ms. Anderson. Chapter 17- key points 1-2. An octave is the interval between two tones with the same name that are seven diatonic pitches apart (C to C). - PowerPoint PPT Presentation
Music History & LiteratureMusical SystemsNovember 18, 2008Presented by Ms. Anderson
Chapter 17-key points 1-2An octave is the interval between two tones with the same name that are seven diatonic pitches apart (C to C). In Western music, the octave is divided into twelve half steps.
Key point 3The chromatic scale is made up of these twelve half steps in descending or ascending order, while a diatonic scale is built on patterns of seven whole and half steps that make up major and minor scales.
Key points 4-5A sharp is a symbol that raises a pitch by a half step; a flat lowers a tone by a half step. Other scale types used around the world include tritonic (three-note patterns), pentatonic (five-note patterns), and heptatonic (seven-note patterns other than major or minor).
Key point 6Some world cultures use intervals smaller than half steps, known as microtones; some scales from other culturesfor example, Indian ragashave extramusical associations.
Chapter 18 Major/MinorComposers can shift the pitch level of an entire work (transposition), or change the center, or key, during a work (modulation). The tonic chord, built on the first scale tone, is the home base to which active chords (dominant, on V; subdominant, on IV) need to resolve. Composers change the key, or modulate, during a piece to create tension and drama.