It is marked Allegro vivo; metronome, crotchet = 100. The form in the earlier black notation resembles the modern quarter note (crotchet). It has a BPM of 128 crotchet beats per minute. The song is written as a march, with repeated crotchet notes in the opening melody. Its main theme has a slow 4/4 with a heavy, steady crotchet beat. These range from a demisemiquaver (, 1) to a dotted crotchet (, 12). The plain number represents a quarter note (crotchet). A related value is the quarter rest (or crotchet rest). Robert Christgau referred to the song as "a McCartney crotchet". For instance, in the beat will be a crotchet, or "quarter note". There are then crotchet chords for 15 bars. For the less skilled, the average span was about half a crotchet beat. Crotchet Castle is the sixth novel by Thomas Love Peacock, first published in 1831.