Original Prague Syncopated Orchestra

The Original Prague Syncopated Orchestra (Czech: Originální Pražský Synkopický Orchestr or OPSO) is a Czech jazz band formed in Prague, in what was then Czechoslovakia, in 1974. It is best known for painstaking reconstructions of performances of music of the 1920s, using authentic instruments, and improvisation in the style of the time.
The initial line-up in 1974 was a five-man band (three wind instruments, piano and banjo) under the artistic direction of musicologist Pavel Klikar. Three more members joined in... plus