Watch the E Minor For All online guitar lesson by Brad Carlton from Chord Studies: CAGED Chords Vol. 1
In this example, you'll be using an E minor form out of the EDCAG system to play both an A minor and a B minor for four beats each. Look at the shape you are making with your fretting hand: This is the exact same shape you would be making if you slid a capo in under your barred first finger and played an E minor. Make sure to minimize squeaking of the strings as you slide from one position to the next.