because it fits in with the theme like the type of the music :)
The role of a violin in a string quartet is the mostly the leader/harmony of the group.
violin
1st violin 2nd violin Viola Cello
First violin, second violin, viola, cello.
violin
Typically a string quartet is two violins, one viola, one cello.
Violin 2 and Viola
Violin, Viola ,Cello and Bass
Usually a first violin, a second violin, a viola and a cello.
Violin 2 and Viola
1st violin 2nd violin Viola Cello
The string quartet is an ensemble for four performers. The ensemble is two violins, a viola and a cello. The first violin usually plays in upper register.