(musTh1) Lecture Notes – More on Intervals

From grading the first homework there are several issues that are popping up across the class.

  • Write clearly. Distinguish between lowercase m and uppercase M. ° and + signs go before size number.
  • Know the quality familes. 1, 4, 5, and 8 are Perfect intervals (°, P, A). 2, 3, 6, 7 are Major/minor intervals (°, m, M, +). You can’t have a Major 5th or a Perfect 3rd.
  • Compound intervals have the same quality families as their simple counterparts. Subtract 7 from the compound interval to find the simple interval.
  • The interval Size always equals the number of diatonic steps, NO MATTER what combination of accidentals is used, or how many half-steps result.
  • Enharmonic intervals do not flip qualities like inverted intervals. Make sure that you analyze them for their proper quality.


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