Feb 26, 2011 - Walking Library has announced the release of Advanced Chord Progressions 1.0. The app combines the essential chord progressions from two of Walking Library's popular apps, Essential Chord Progressions and More Essential Chord Progressions. This app features more than 320 chord progressions and sound samples curated by Gary Ewer of Dalhousie University. The chords in this app are completely modifiable. The chords are written using guitar fret board notation and illustrate suggested voicings for the chords.