It covers all the essential topics in music theory, from rhythm and pitch to intervals, major and minor scales and compound time signatures. It also goes beyond these basic concepts to more advanced theory such as harmony, tone colour and musical form, to provide a genuinely comprehensive introduction to music theory.
The theoretical information is all backed up by plenty of practical exercises, and the book includes accompnying audio on the Teach Yourself Library with further practice activities, to really consolidate your knowledge.