Posted in The Jazzy stuff (but good for every style!) Jazz guitar: Altered Chords Pt1 by Gianni C. on August 9, 2010 Altered chords are a flavour of dominant chords, where we add certain extensions: #9,b9,#5,b5. In the example on the video I use C7 as basic chord and add the extension D#,Db,G#,Gb also as combinations.