The mother and father of two-piano jazz albums has to be 1978’s An Evening With Herbie Hancock & Chick Corea: In Concert.

July is a long time away. But in this strange world people sleep on the pavements to get their mitts on 1D tickets. And while jazz-piano fans might not be warbling standards to keep their spirits up camped out tonight, if they were it would not be half as crazy bearing in mind tickets go on sale in the morning for Chick Corea and Herbie Hancock playing together at the Barbican on 6 July.