Describe the stylistic features of Partita No. 4 in D, BWV 828: Sarabande and Gigue by Bach which show that this music was composed in the Baroque period.

The stylistic features relating to genre, tonality, harmony, texture, melody and structure show that this work by Bach is from the Baroque period. Firstly, both the Sarabande and Gigue were dances that very common in the Baroque Period, which Bach set to music in this Partita for the harpsichord (or clavichord). They are part of a larger suite of dances, called a Partita, which was particularly common and popular in the Baroque Period (for example, Handel's Water Music Suite). Both dances are very different from each other, but each retains its distinct sense of character throughout each movement (i.e. it does not have sudden changes of character and mood in the middle).Tonally, both dances (as well as the rest of the suite) are all in D major, which matched the set temperament of the harpsichord for the suite. Harmonically, the movement, or modulation, towards closely-related keys, such as A major, B minor and G major, is very common for Baroque music. The melodic writing is in the Baroque style in that it is based on the triadic structure of the harmony and contains much ornamentation of appogiaturas, trills and mordents. Texturally, the Sarabande is demonstrative of the simplistic writing for a single voice above a moving ground bass, and the the interplay of independent voices in both hands throughout the Gigue is demonstrative of typical use of counterpoint by composers in the Baroque period, particularly Bach. The Gigue is also based on fugal writing, a compositional practice most commonly associated with Bach and the Baroque Period.