Flutes have cylindrical holes. They are usually made of metal, often silver or nickel silver obviously there are also other materials such as gold and platinum used in their construction. Adding the keys into the flute (and changing them into the flute) allowed the player to create a wider range of notes and play more complex pieces much more simply compared to older simple flutes.
Music in Stuttgart
Stuttgart is another city in Germany where music is very important. This city is the birthplace of very famous music groups and singers of different styles in the world. Among the city's most famous bands and singers are Bach-Collegium Stuttgart (an internationally renowned German ensemble founded by Helmut Rilling in 1965 to accompany Gatchinger Cantor in choir music with an orchestra), Bachur Stuttgart (an orchestra and Stuttgart-based choir (Germany), DJ Bant, Die Fantastischen Vier (hip-hop group) and Figuralchor der Gedächtniskirche Stuttgart (a church and concert-based choir based in Stuttgart).