25 essential rhythm patterns you must know. 25 exercises with tabs and 25 audio tracks. Two chords and two bars by rhythm pattern. Tabs with strumming and chord diagrams. Chords used : C, D, E, G, A, Am7, D7, E7, A7, G, G7, B7, Dsus4, Asus4, E7sus4, A7sus4, Am.