Section 13 of this work i
Section 13 of this work is the only one without a title; though a quote within it from Mendelssohn's Calm Sea and Prosperous Voyage implies that the person was on a sea voyage.  Section 4 features a door slamming, a tribute to the composer's friend, William Baker.  Section 5 was inspired by the nervous laughter of Richard Arnold, son of the poet Matthew.  The most famous section was inspired by a nighttime walk with the composer's best friend August Jaeger, and is titled "Nimrod." The first represents the composer's wife and the last represents the composer in this series of 14 vignettes. FTP, identify this set of variations for orchestra, written by Edward Elgar and so-named because of their puzzling meaning.
Section 13 of this work is the only one without a title; though a quote within it from Mendelssohn's Calm Sea and Prosperous Voyage implies that the person was on a sea voyage.  
Enigma Variations