This tutorial covers a key ingredient for playing beautiful, jazz and neo soul piano voicings: adding upper extensions like 9s, 11s, and 13s. If you want your chords to sound professional over chord progressions, understanding these concepts is key: everyone from Art Tatum, Robert Glasper, Bill Evans, Chick Corea, Keith Jarrett, Brad Mehldau, etc. uses extensions in different ways in their playing.