I don't know which scale to use in this progression
, . . . , . . . , . , . , . . .
Em D C Cm Em
, . . . , . . . , . , . , . . .
Em D C Cm G
, = is when the chords change
. = beats
I want to learn the theory behind it, can anyone help me with this? I am a intermediate guitar player, but a beginner in music theory, so where can I start?