Moving Between Chords: D7 and B7
The D7 Chord
The B7 Chord
With each new chord that we learn, start practicing switching between the chords by strumming whole notes at 60bpm. The goal with these exercises is to play in time but allow for a substantial amount of time to learn to switch the chord and stay in time with the metronome.
It is very important to move from the lowest string to the highest string, so you should always place the lowest note of the chord down first and work up the strings from there.
When comfortable switching chords using whole notes, try to move on to the next exercise using half notes, which are strummed every two beats.
Finally, we will practice our main goal, which is to switch chords effectively and repeatedly while strumming quarter notes in the right hand.
All of the exercises below should be played with downstrokes only.
Exercise 1 - Whole Notes (4 beats Per Measure)
Exercise 2 - Half Notes (2 beats Per Measure)
Exercise 3 - Quarter Notes (1 beat Per Measure)

