Depends on the style of classic music as some play more like pop or boy bands. Then again there are those like Beethoven who is every bit a rock star at his core. Add to this you only need a quick search to find classic music done with electrical instruments or rock and metal done with classical instruments.
There are purists on all sides that don't like the mixing of styles but then there are those who knock down these made up rules just because they are there. There are the well known iconic versions player on the electric guitar such as Vivaldi's The four seasons or Beethoven's Moonlight Sonata that even the purists would be hard pressed to dislike. On the other side there are easy to find groups on youtube like the 2 Cellos and many others reversing the idea.