It is regarded as Chuck Jones' masterpiece (by Jones and many others), requiring about 6 times as much work and expense as any of the other 6-minute cartoons his studio was producing at the time. During those 6 minutes, Jones lampoons
The cartoon and lyrics were written by Michael Maltese, the music adapted from Richard Wagner, the impressive and unusual background work by Maurice Noble. The short has been deemed "culturally significant" by the United States Library of Congress and selected for preservation in the National Film Registry.
Also see: Looney Tunes, Looney Tunes & Merrie Melodies filmography