The document discusses keyboard instruments from the Baroque period, including three that are now obsolete: the virginal, spinet, and clavichord. It also covers two instruments that are still used today: the harpsichord and pipe organ. Examples of music played on each instrument are provided to illustrate their distinct sounds. The harpsichord was widely used in the Baroque era but was later replaced by the piano, which allows for more nuanced tone and volume.