You probably have few or no problems in finding and playing chords without extensions and alterations. But how do you play extended and altered chords? What notes do you need to play F7, #9, b13? Or Bm7,9? Or A7sus13? In this app you can see and hear the extended and altered chords being played in root position with the names of the chord notes written below. Tormod Vinsand is a jazzpianist and composer and have been teaching jazzpiano at Rhytmic Music Conservatory, The Royal Academy of Music and Copenhagen University in Copenhagen, Denmark since 1988.