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

Char t 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