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 San Francisco
San Francisco is a city with rich music history. Jazz, punk, and rock music all have deep roots in this city. You may know San Francisco's famous artists like Grateful Dead and equally famous residents like Janis Joplin and Jimi Hendrix. However, other popular groups started in the city. Journey, Green Day, and even MC Hammer started here. The biggest music scene in San Francisco is Fillmore. This recreation area, also known as the heart and soul of the city, first opened more than 100 years ago. Theaters, dance halls, nightclubs, and music venues have resided or still reside here and have attracted various singers and other musical arts over time. Bob Weir and Jerry Garcia, Marty Ballin, Carlos Santana, Janice Joplin, Hoy Lewis, etc. are some of the music stars of this city. Noise Pop, North Beach Festival, Union Street Festival, SF Jazz Festival, Fillmore Jazz Festival, Stern Grove, etc. are just some of the festivals that are held in this city.