NOTE: ALL MY EDUCATIONAL MATERIALS ARE MOVING TO THE JAZZ IMPROV INSTITUTE at https://www.jazzimprov.net/ . This blog post will be retired.
Every musician should sit down at the piano and hammer out the 2 note voicings for every song they learn. In this case, these are the guide tones, or the 3rds and 7ths of each chord. The guidetones are the most important parts of the chord because they identify major/minor for the 7th and the triad.