Eight of the chart-toppers were released during the first half of the 1970s, with only Crimson's In The Court Of The Crimson King and Rush's Moving Pictures coming from other decades.

And only eight later-generation prog acts make the magazine's top 50 - The Mars Volta at number 25, Opeth at 28, Dream Theater at 29, Tool at 33, Porcupine Tree at 39, Meshuggah at 42, Marillion at 47 and Ruins at 49.