Between the 14th and 17th centuries
C.E., this musical term referred to a
strambotto siciliano that had been set to music, either as an
a cappella piece or with accompaniment. Since then, this term has shifted in meaning. Currently, it refers to a certain type of
aria and instrumental movement, both
in vogue from the late 17th to the 18th centuries. As a style, it can chiefly be found in the vocal and instrumental music of the late
Baroque period.
The siciliana sicilano is played in either a slow 6/8 time, or 12/8 time. It is characterized by the use of clear 1- or 2-bar phrases, lilting rhythmns, simple melodies, and direct harmonies. The content usually connected to this form was the pastoral scene and/or some form of melancholia.
Famous composers who used the siciliana siciliano for operas or cantatas include A. Scarlatti and G.F. Handel.
Chief source for this writeup: The Grove Concise Dictionary of Music.