On July 24 1987, Madonna performed her Who’s That Girl World Tour at the Astrodome in Houston, in front of 40,000 fans.

The title Who’s That Girl Tour came to Madonna during rehearsals one-day when she looked at a gigantic image of herself projected on a screen on the stage. She commented,

“Oh god, what have I done? What have I created? Is that me, or is this me, this small person standing down here on the stage? That’s why I call the tour ‘Who’s That Girl?’; because I play a lot of characters, and every time I do a video or a song, people go, ‘Oh, that’s what she’s like.’ And I’m not like any of them. I’m all of them. I’m none of them. You know what I mean.?”