Looking at the music of Dutch rock band Focus, started in the late sixties by Thijs van Leer (b /31/03/48) with Jan Akkerman (b 24/12/46). Van Leer still performs and records under the name today (official site here). Akkerman's site here.

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Focus 1985 Pie Chart

Chart showing the proportion of the album taken up by each track

Focus Con Proby Pie Chart

Chart showing the proportion of the album taken up by each track