The Houston concert received a lot of extra attention because Ron McNair was meant to play sax for the piece Last Rendez-Vous, which usually is presented dedicated to him as "Ron's Piece". Then Challenger blew up, and Jarre considered cancelling until people at NASA convinced him otherwise. So while I'm sure Houston would have welcomed Jarre without it, that concert got a special role as a celebration of the astronauts of Challenger.

Ron's Piece is one of my favourite pieces of music and haunting enough and sad enough on its own, but the history of it makes it even sadder.