Praetorius, Schütz, Rebillé, Quantz, J.S Bach, Telemann, Blavet, Vivaldi, Hotteterre, Handel and Frederick the Great. Aside from the composition of new music, several books were published during this time that dove into the study of the Baroque flute. In 1707, Jacques Martin Hotteterre wrote the first method book on playing the flute: Principes de la flûte traversière. The 1730s brought an increase in operatic and chamber music feature of flutes. The end of this era found the publication of Essay of a Method of Playing the Transverse Flute by Quantz. When compared to the modern flute, the Baroque flute requires less airflow, and produces much softer, mellower sounds: often blending in with other instruments in the orchestra. Additionally, when compared to the modern flute, the baroque flute requires the player to adjust with each note in order to make sure it is in tune. More adjustments are needed when playing notes outside of the D major scale. The flutist can change this pitch through small adjustments in the mouth and by turning the flute towards or away from the player. This need for continued adjustment was alleviated with the creation of more modern flutes. With the onset of the Romantic era, flutes began to lose favor: symphony orchestras rather featured brass and strings. However, with the onset of the 21st century, there has been a rise in the popularity of the Baroque flute, most notably led by flutist Barthold Kuijken, and others such as Frans Bruggen, Emi Ferguson, Peter Holtslag. These baroque flutists freqeuntly perform in popular Baroque Orchestras that travel the world playing music using instruments from this period, as well as mimicking the style of music and performance techniques during this era. Development Boehm flute In the nineteenth century, the great flautist, composer, acoustician, and silversmith Theobald Boehm began to make flutes. Keys were added to the flute, and the taper was changed to strengthen its lower register. The dimensions and key system of the modern western concert flute and its close relatives are strongly influenced by Boehm's design, which he patented in 1847. Minor additions to and variations on his key system are common, but the acoustical structure of the tube remains almost exactly as he designed it. Major innovations were the change to metal instead of wood, large straight tube bore, "parabolic" tapered headjoint bore, very large tone holes covered by keys, and the linked key