Interesting program! Prom 46, which I almost passed on the first time around because of unfamiliarity with some of the music, turned out to be a winner and BBC Radio 3 rebroadcast it earlier this afternoon on their Afternoon on 3 program, which is available on demand for seven more days.
Opening piece was a five minute item named The Foundry, composed by Mosolov(who I'd never heard of)to picture increasing industrialization. Noisy and fun to listen to. In contrast, there followed the sparse textures and many moments of complete silence(real dynamic range there!)of the Estonian composer Arvo Part, who was present in the hall. Serene music with moments of beauty.
After intermission, more familiar music was heard, beginning with the Ravel Concerto for the Left Hand, composed for a pianist who'd lost his right arm in World War I. Concluding the concert was the massive Poem of Ecstasy which Scriabin composed on various erotic themes.
Available at the BBC Radio 3 site here