Drop 2 chords are a way to play different variations of the chords with a 7th. In theory, drop 2 refers to the second note from the top of the chord that you drop to the bottom of your original chord. Then, you do the same process for the three inversions of the chord as shown below.
Below are the different fingering for each of these chords. You can use them in different genres where you will use chords with a 7th extension. Each diagram shows the four different variations of shapes for each chord.
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