ChordLab is a unique music application that tackles advanced concepts in harmony. So beware – this is not the generic chord-book app that guitar players use to look up a diagram for an E or A chord. ChordLab deals with harmony as a whole. Instead of displaying two or three diagrams for that E chord ChordLab puts it into context, lets you play around with it by applying inversions, voicings or adding tensions – concepts that make much more sense once one steps away from TAB and diagrams for a second and also takes a look at music notation.