A thematic signature is a musical MOTIF that is used to identify a particular piece of music. It is often used to create a sense of unity and continuity throughout a composition. The term 'MOTIF' refers to a short, recurring musical phrase that is repeated throughout the piece. A thematic signature is usually composed of several motifs that are combined in various ways to create a unique sound. This type of signature can be used to create a recognizable identity for a piece of music, making it easier for listeners to recognize and remember it.