It is a complete introduction to harmonic composition of classical popular and popular music with examples from the traditional and contemporary song. The collection “Applied Harmony” covers all the classical harmony material, from diatonic harmony of both major and minor scales until the extended tonality, modal interchange and chromaticism. It is presented an original research of harmony in blues, rock and jazz. It is presented in a comprehensive way, for the first time in Greek bibliography, Greek music harmony (traditional, rebetiko and popular).