Readability and legibility are both areas of which I will need to consider for my work as it needs to be read so the viewer understands how type can represent sound.
Readability is how easy it is to read words.
Legibility is how each individual letter can be read. How certain words can be read and kerning and leading(line spacing) shows how a word could be said or how line spacing can show pauses.
(Spiekemann and Ginger, 2003)