Repetition is important in music, where sounds or sequences are often . One often stated idea is that repetition should be in balance with the initial statements and variations in a piece. It may be called restatement, such as the restatement of a theme. While it plays a role in all music, with noise and musical tones lying along a spectrum from irregular to periodic sounds,(Moravcsik, 114)(Rajagopal, ) it is especially prominent in specific styles. A literal repetition of a musical passage is often indicated by the use of a repeat sign, or the instructions da capo or dal segno.