Simon and Garfunkel. They took the name in 1957 but quickly changed it to the one that became famous.
A band, a group or musical ensemble
A group of Musical Instruments is called a consort.
sextet
It is called acapella.
A group of orangutans is known as a buffoonery.
Chicago Transit Authority
The Indigenous people of Dominica in the Caribbean were originally called robins by Christopher Columbus.
A capella
A group of eight anything is called an "octet".
A group of seven people is a septet. The word is usually used in a musical connection.
The Chicago Transit Authority
No