Memory scann listening

When an auditor knows a work by memory, a special type of signal listening called scan listening is possible. An auditor may approach a memorized work with a question concerning the occurrence of a certain event: For example, the auditor may be interested in knowing whether the composer has used timpani in a given work; or does the word "but" occur in the lyrics to "Row Row Row Your Boat?" The scan listener will mentally execute a speedy rendition of a work in order to answer a given question. What distinguishes scan listening from signal listening is that the auditor tends to be impatient: the tempo of the music can be doubled or quadrupled to advantage for the scan listener.