The man that hath no music in himself,

Nor is not mov’d with concord of sweet sounds,

Is fit for treasons, stratagems, and spoils;

The motions of his spirit are dull as night,

And his affections dark as Erebus:

                                                  Let no such man be trusted, Mark the music

                                                                        

--William Shakespeare The Merchant of Venice (Act V, Scene 1)