Steps and skips
In music, a step, or conjunct motion, is a linear or successive interval between two pitches which are consecutive scale degrees. Any larger interval is called a skip (also called a leap), or disjunct motion. In the diatonic scale, a step is either a minor second or major second, with all intervals of a minor third or larger being skips.
For example, C to D (major second) is a step, whereas C to E (major third) is a skip.
More generally, a step is a smaller or narrower interval in a musical line, and a skip is a wider or larger interval, with the categorization of intervals into steps and skips is determined by the tuning system and the pitch space used.
Linear motion in which the interval between any two consecutive pitches is no more than a step, or, less strictly, where skips are rare, is called stepwise or conjunct melodic motion. Melodic motion characterized by skips is called skipwise or disjunct.
Half steps
Measured in half steps the difference between steps and skips becomes fairly clear:
Unison: 0 Steps: 1-2 Skips: 3+
Melody
Melody may be characterized by its degree and type of conjunct and disjunct motion. For example, Medieval plainchant melodies are generally characterized by conjunct motion with occasional thirds, fourths, and generally ascending fifths while larger intervals are quite rare though octave leaps may occur between two separate phrases. Renaissance melodies are generally characterized by conjunct motion, with only occasional leaps of more than a fifth and then rarely anything but a sixth or octave. In contrast, melody in the 20th century varied greatly including the diatonic idiom of the 18th century (Classical), the variety of idioms from the 19th century (Romantic), and newer nondiatonic scales in the 20th century. Some of these later idioms included many or predominately leaps.
See also
References
Retrieved from : http://en.wikipedia.org/wiki/Steps_and_skips
