| Some of his chamber works are the eight string quartets, two piano trios, two piano quintets, a piano quartet and sonatas for violin and cello. |
| From barbershop quartets to gospel close-harmony groups to doo-wop to the kooky a cappella experiments, vocals-only pop music has a long history. |
| Over the years, he has led big bands and played with trios, quartets, and other types of groups as well as playing solo. |
| Barbershop singing originated in the US at the turn of the last century, when quartets would sing in real barbers' shops. |
| He counts work on Shostakovich's quartets with Rostropovich as among the high points of his musical life. |
| Brady Johnson has been singing in gospel quartets for many years and is a member of the Muddy River Quartet. |
