 Irrational time signatures in the mathematical sense are very rare, but one example (/1) appears in Conlon Nancarrow's "Studies for Player Piano".As a data type used by computers, floating-point numbers are often defined as integers multiplied by positive or negative powers of two, and thus all numbers that can be represented for instance by binary IEEE floating-point datatypes are dyadic rationals.The same is true for the majority of fixed-point datatypes, which also uses powers of two implicitly in the majority of cases.