With it's plot derived from Arthurian legend, Tristan und Isolde is considered by many to be the most harmonically daring and overtly sensual of the composer's operas. From the famous opening 'Tristan chord' of the Prelude, repeated at key points in the drama, to it's over-powering harmonic resolution at the end of the Liebestod (Love-Death), the opera is remarkable for the hypnotic power, physical longing and intense human emotion sustained over more than three years.