👉 Sistra is a term in classical and modern music theory, specifically used to denote an interval between two notes on a musical instrument. It can also refer to the structure of a piece of music, where there are several measures (sisters) that are played simultaneously within the same piece. In classical music, sistras are often used to indicate the time signature or tempo of a piece, as they represent the duration between two successive notes in the score. For example, if you have a