RILM abstract: "Crotch's pendulum markings are an important source of information on English tempos at the end of the 18th c. and represent an ongoing practice among late 18th-c. English composers. Statistical study of English glees with pendulum markings from this period promises to yield valuable results."
"New Light on Late Eighteenth-Century Tempo: William Crotch's Pendulum Markings,"
Performance Practice Review:
1, Article 1.
Available at: http://scholarship.claremont.edu/ppr/vol2/iss1/1