harp  guitar (for veronika doina)

we hold on the left string
or change the one before the game of the right hand
the  sound is changed

the violin
we presson the string
or not 
and move the stic k
vibrato
semi-vibrato
rubato

depending on put up the string

the  cello alto double bass the sa,e

we press the key on the piani or not
playing just the right (left )hand
or  we play by one singer left less
more right
or vice versa