Prolation Prolation Prolation is a term used in the theory of the mensural notation of medieval and Renaissance music to describe its rhythmic structure on a small scale, as opposed to "tempus", which described a larger scale. The term "prolation" is derived from the Latin "prolatio", first used by Philippe de Vitry in describing Ars Nova, a musical style that came about in 14th-century France. Prolation, together with tempus, corresponds roughly to the concept of time signature in modern music. Prolation describes whether a semibreve (whole note) is equal in length to two minims (half notes) ("minor prolation" or "imperfect prolation";
Australian two-dollar note a gold-coloured coin in 1988, due to the longer service life and cost effectiveness of coins. These notes can still be redeemed at face value by the Reserve Bank of Australia and most commercial banks, but numismatics and note collectors may pay a higher price for these notes depending on age and condition. Australian two-dollar note The Australian two-dollar note was introduced in 1966 due to decimalisation, to replace the £1 note which had similar green colouration. The note was issued from its introduction in 1966 until its replacement by the two dollar coin in 1988. The paper design included