Music-Theory Resources

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Hybrid research involving concepts from both standard music curricula and audio engineering may employ hierarchies of values explained by different terms of reference. Conversely, similar terms of reference as employed by different communities may presuppose divergent contexts and uses. We emphasize tools and terminology that can support collaborators across a spectrum of specialties.


Musical intervals refer to the distance between two pitches.

  • If consecutive, they are melodic intervals.
  • If simultaneous, they are harmonic intervals.

Types of intervals depend on the distance between the two pitches.

Within the realms of both sound and notation, several units of measurement are recognized.

Intervallic unit-types in sound

Intervallic units in notation

In the context of tonal music, the same vocabulary of intervallic names is used, but the grammar of intervallic combinations is based on notation and its written conventions in the tonal era (roughly 1690-1911).