Number of different timbral code-words used to describe each sound.

Examples computed from 30 s audio files using an analysis window of 186 ms (160 temporal windows in total). Pink and white noise sounds were generated using Audacity (http://audacity.sourceforge.net). String Quartet corresponds to a rendition of F. Haydn's Op.64 No. 5 “The Lark”, Voice, Drums, Bass & Synth. Strings corresponds to Michael Jackson's Billie Jean, Philharmonic Orchestra corresponds to a rendition of The Blue Danube by J. Strauss II, and Voice and Electronic Instruments corresponds to Depeche Mode's The world in my eyes.