Words and sentences that do not change when they are read backwards.

Musical palindromes are synonymous with retrograde movements. In a palindromic section in ALBAN BERG'S opera LULU, the music revolves backward to depict the story of Lulu's incarceration and escape. Samplers of palindromic canons are found in NICOLAS SLONIMSKY'S Thesaurus of Scales and Melodic Patterns.