With all the video lessons posted about drop two's I wanted to give you a visual aid to remind you why they exist.
In the image below you can see how the first, stacked Cmaj7 chords are quite hard to play on the guitar. If not impossible. On piano no problem. So drop the second note from the top in the stacks on the left down an octave to create a new and improved second chord voicing that you can really rap your hand around.