“The vertical complexities of Gentle Giant’s music is tailor-made for Dolby Atmos,” noted Steven Wilson, who was pointed out to the ticket-paying/invited throng by Derek. If you’ve read thus far, you’re probably already initiated into the complex musical delights of In A Glass House. Gentle Giant fan, Stuart Maconie, who curated the Prog Proms, would likely agree. Their combined musical flexibility is reflected in their inimitable oeuvre of challenging rock, classical, medieval, baroque, jazz, fusion and, well, unique Gentle Giant music. There may be a heatwave on, but inside this air-conditioned playback, the music still does not go gentle into the night.