The double bass (/ˈdʌbəl beɪs/), also known simply as the bass (/beɪs/), amongst other names, is the largest and, therefore, lowest-pitched chordophone in the modern symphony orchestra (excluding unorthodox additions such as the octobass). Similar in structure to the cello, it has four, although occasionally five, strings.
The bass is a standard member of the orchestra´s string section, along with violins, viola, and cello, as well as the concert band, and is featured in concertos, solo, and chamber music in Western classical music. The bass is used in a range of other genres, such as jazz, blues, rock and roll, rockabilly, country music, bluegrass, tango and folk music.
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