Music Theory
Music theory.net: Phrases and Cadences
An explanation of phrases and cadences with illustrated examples. Also provides audio clips, and a printable chart at the end of the lesson. By MusicTheory.net.
Wikimedia
Wikipedia: Cadence
Read about the musical term cadence and its importance in music and dance. Includes a description of the four main types of cadences in modern music theory and other definitions of cadence at this site.