This backing track e minor ballad has a simple but often used chord progression. You can improvise over it either with e minor pentatonic or e natural minor. The chords are Em7 Cadd9 Dadd9/add11 in the a section and Cadd9 / G/B in the b section Em7 = 022030 Cadd9 = x3203x Dadd9/add11 = x5405x G/B = x20033