Most chamber orchestras have a conductor. Sometimes the concertmaster takes the position of "leader" and does the conducting from her/his seated position. Specifically, the Orpheus Chamber Orchestra works without a conductor. They work out the tempi and other features during rehearsal.
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Of course not. If you can play well, there is no required qualification. Especially in popular music, there is no need to do exams as long as you have passion, talent and skill.
Chamber music is basically just instrumental music played by a small ensemble with one player to a part. A string quartet only consists of four players: first and second violin and viola and a cello. As such, string quartets are considered to be a type of chamber music because it involves a small group of musicians.
Orchestral music is, simply, music composed for an orchestra. "Classical" is a period (c. 1750 to 1820) in music histoy, however people often use the term classical to describe all western music of a high standard.
The group 3XL perform pop, dance and R&B music. One can watch some of their performances and music videos on the social media video sharing site YouTube.
A ten piece band, or in classical music a small chamber orchestra.