Duple and quadruple metre compound duple metre though it may locally emphasize simple triple, such as the famous example of Leonard Bernstein's song "America" from "West Side Story". The most common time signature in rock, blues, country, funk, and pop is . Although jazz writing has become more adventurous since Dave Brubeck's"Time Out", the majority of jazz and jazz standards are still in four time. Duple time is common in many styles including the polka, notorious for its obvious "oom-pah" duple feel. Compare to the waltz. Binary measure refers to common time. Quadruple metre (also "quadruple time") is a musical metre characterized in modern
Quadruple product Quadruple product In mathematics, the quadruple product is a product of four vectors in three-dimensional Euclidean space. The name "quadruple product" is used for two different products, the scalar-valued scalar quadruple product and the vector-valued vector quadruple product or vector product of four vectors . The scalar quadruple product is defined as the dot product of two cross products: where a, b, c, d are vectors in three-dimensional Euclidean space. It can be evaluated using the identity: or using the determinant: The vector quadruple product is defined as the cross product of two cross products: where a, b, c, d