Abstract: This paper, a study on how to use anomalous rhythm in vocals. The purpose of this study is to suggest a method so that musicians, such as composers, lyricists, arrangers,producers, and vocalists, who make songs that include songs can utilize more diverse and original vocal rhythms. The research method is to compare the melodies and scat of anomalous rhythms used in the album and live performances of representative fusion jazz vocalist Al Jarreau, and compare the structure of the music beat and the modified beat derived from the structural point of view of grouping at a glance. made it recognizable. As a result of the study, , and were performed in 4 A grouping structure that combines the lengths of quarter notes and 8th notes was used, and uses a grouping structure that combines the lengths of quarter note and 16th note for vocals. It was derived that unique songs and scat were created by applying anomalous grouping to the rhythm played by all instruments except for four beats per word.