Extract the names of all the members of the Henry Holst String Quartet, and the instrument they played in bullet point form.

- Henry Holst (violin)
- Charles Taylor (violin)
- Herbert Downes (viola)
- Anthony Pini (cello)
- Ernest Element (violin)
- Frank Venton (viola)
- Reginald Stead (violin)
- John C Hock (cello)