Cadenza in the context of "Fermata"

Bob and wheel is a pairing of two metrical schemes. The wheel is a type of rhythm used in hymns or narrative songs sung in European churches or gatherings from the 12th to the 16th Centuries. A wheel occurs when at the end of each stanza, the song and the lyric return to some peculiar rhythm. In some instances the wheel is a return to something that resembles no definable poetic rhythm. A bob is a very short line, often two assertive syllables that announces the start of the wheel.

As an interruption of the usual rhythm, the bob and wheel has been compared to a cadenza in music. It is a way of adding recurring, abrupt and forceful variety to a song or verse for a short passage.

The Violin Concerto in D minor, Op. 47 of Jean Sibelius, originally composed in 1904 and revised in 1905, is the only concerto by Sibelius. It is symphonic in scope and included an extended cadenza for the soloist that takes on the role of the development section in the first movement.

It is not known when Mozart completed his Concerto for Two Pianos and Orchestra in E-flat major, K. 365/316a, but research by Alan Tyson shows that cadenzas for the first and third movements are written in his and his father's handwriting on a type of paper used between August 1775 and January 1777. However, most sources, including Tyson's book Mozart: Studies of the Autograph Scores or more recently Lindeman's The Concerto: A Research and Information Guide (2006) indicate that it was composed in 1779. It is presumed that Mozart wrote it to play with his sister Maria Anna ("Nannerl"). Years later he performed it in a private concert with pupil Josepha Barbara Auernhammer.