- The Summer Triangle is an astronomical asterism in the northern celestial hemisphere. Its defining vertices are triangle are Altair, Deneb, and Vega, each the brightest star of its constellation (Aquila, Cygnus, and Lyra, respectively). The greatest declination is +45° and the lowest is +9°, meaning the three stars can be seen from all parts of the Northern Hemisphere and from much of the Southern Hemisphere. The stars in Aquila and Cygnus represent the head of an eagle and tail of a swan, respectively, which appear inscribed within the triangle and form its altitude of the triangle. Two small constellations, Sagitta and Vulpecula, lie between Aquila in the south of the triangle and Cygnus and Lyra to the north.
- Fugue (Wikipedia)
In classical music, a fugue (/fjuːɡ/) is a contrapuntal, polyphonic compositional technique in two or more voices, built on a subject (a musical theme) that is introduced at the beginning in imitation (repetition at different pitches), which recurs frequently throughout the course of the composition. It is not to be confused with a fuguing tune, which is a style of song popularized by and mostly limited to early American (i.e. shape note or “Sacred Harp”) music and West Gallery music. A fugue usually has three main sections: an exposition, a development, and a final entry that contains the return of the subject in the fugue’s tonic key. Fugues can also have episodes—parts of the fugue where new material is heard, based on the subject—a stretto, when the fugue’s subject “overlaps” itself in different voices, or a recapitulation. A popular compositional technique in the Baroque era, the fugue was fundamental in showing mastery of harmony and tonality as it presented counterpoint.