E major
E major is hard for wind instruments to play. It is quite good for violin, because two of the open strings are A and E, the tonic and subdominant. Other orchestral string instruments can play well in it, and it is also good for the guitar. When writing in E major, clarinets in A should be used instead of clarinets in B-flat to make it easier to play. This is because clarinets are transposing instruments.