For anyone like me who is mildly obsessed by the curiously hypnotic and I occasionally think over-seductive piano playing of the Icelandic pianist, Vikingur Ólafsson, I strongly recommend the first fifteen minutes of a recent episode of Music Matters as below, in which he explains the thinking which has gone into his new album, From Afar, in which he plays the same music on an upright and a grand piano to differentiate the nature of the experience. The upright is like being inside the piano. He talks nearly as intensely as he plays:-

https://www.bbc.co.uk/sounds/play/m001c71k?partner=uk.co.bbc&origin=share-mobile