Music Theory is Fun: Books 1 to 5 Omnibus is the complete set of the series of five separately published books Music Theory is Fun by Maureen Cox
. This omnibus edition provides a convenient step-by-step, easy to follow course for anyone learning to sing or to play an instrument, studying the theory of music or revising for examinations.
These books cover:

• key signatures
• scales - major, harmonic & melodic minor, chromatic
• regular and irregular time signatures and rhythms
• intervals and chords
• perfect, imperfect and plagal cadences
• concert pitch & transposition
• short & open score
• accidentals & ornaments
• composing a melody for instrument or voice
• instruments of the orchestra;

At the end of the omnibus there is a full dictionary of French, German and Italian musical terms as well as common alternative terms, and a list of signs.