In July 2020, which musician streamed a concert performing on a grand piano at Alexandra Palace?

"Idiot Prayer: Nick Cave Alone at Alexandra Palace" is a concert film and live album by Australian musician Nick Cave. It was streamed globally to ticket holders online on 23 July 2020. It was filmed by cinematographer Robbie Ryan and features Cave performing solo on piano at Alexandra Palace in London. Although initially intended to be a one-time-only event, "Idiot Prayer" was released in extended form in cinemas on 5 November 2020 and as a live album on 20 November 2020.

Nicholas Edward Cave (born 22 September 1957) is an Australian singer, songwriter, author, screenwriter, composer and occasional actor. Known for his baritone voice and for fronting the rock band Nick Cave and the Bad Seeds, Cave's music is generally characterised by emotional intensity, a wide variety of influences and lyrical obsessions with death, religion, love and violence.