Abstract: A Sound on Sound-Annotations (SOS-A) system facilitates the collection, categorization, and retrieval of streams of sound. A stream of sound is captured and annotations of sound concerning the stream of sound are generated for positions of interest or relevancy. The annotations add additional information concerning the stream of sound at the points of interest. Markers of sound are logically or physically inserted in the stream of sound to identify the locations associated with the annotations of sound. The markers of sound point to or link the annotation of sound. The annotations of sound are also captured and can convey any information desired; for example, add description, provide evidence, challenge the validity, ask questions, etc. Any form or frequency of sound can be utilized with the stream of sound, the marker of sound, and/or the annotations of sound.