Interval quality: Difference between revisions

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== Relative interval quality ==

In any scale, each [[interval class]] consists of the set of all intervals that span a given number of [[step]]s. For example, all intervals that span two steps of a scale are ''thirds'' or ''2-steps'' (the latter form being often used to avoid confusion with absolute interval quality). Scales with a higher density of notes compared to the diatonic scale typically have smaller 2-steps ~~and vice versa~~; as a result, the 2-steps may fall outside of the usual range for diatonic thirds (i.e. between 240{{cent}} and 480{{cent}}).

In any scale, each [[interval class]] consists of the set of all intervals that span a given number of [[step]]s. For example, all intervals that span two steps of a scale are ''thirds'' or ''2-steps'' (the latter form being often used to avoid confusion with absolute interval quality). Scales with a higher density of notes compared to the diatonic scale typically have smaller 2-steps; as a result, the 2-steps may fall outside of the usual range for diatonic thirds (i.e. between 240{{cent}} and 480{{cent}}).

In an [[equal tuning|equal scale]], each interval class contains a single perfect interval; in other words, each interval is perfect. Therefore, both intervals 5\[[8edo|8]] and 5\[[13edo|13]] are perfect sixths (or perfect 5-steps) within their respective [[edo]] taken as a scale, even though they have significantly different sizes.

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 == Relative interval quality ==
-In any scale, each [[interval class]] consists of the set of all intervals that span a given number of [[step]]s. For example, all intervals that span two steps of a scale are ''thirds'' or ''2-steps'' (the latter form being often used to avoid confusion with absolute interval quality). Scales with a higher density of notes compared to the diatonic scale typically have smaller 2-steps and vice versa; as a result, the 2-steps may fall outside of the usual range for diatonic thirds (i.e. between 240{{cent}} and 480{{cent}}).
+In any scale, each [[interval class]] consists of the set of all intervals that span a given number of [[step]]s. For example, all intervals that span two steps of a scale are ''thirds'' or ''2-steps'' (the latter form being often used to avoid confusion with absolute interval quality). Scales with a higher density of notes compared to the diatonic scale typically have smaller 2-steps; as a result, the 2-steps may fall outside of the usual range for diatonic thirds (i.e. between 240{{cent}} and 480{{cent}}).
 In an [[equal tuning|equal scale]], each interval class contains a single perfect interval; in other words, each interval is perfect. Therefore, both intervals 5\[[8edo|8]] and 5\[[13edo|13]] are perfect sixths (or perfect 5-steps) within their respective [[edo]] taken as a scale, even though they have significantly different sizes.