Kanye was the opening act for Usher on the Confessions tour

NeYo was opening act on Jay-Z's 2006 tour

Kendrick was the opening act for Kanye on Yeezus tour

Travis Scott was opening act for Kendrick Lamar

what were some other tours where the supporting act became a MAJOR act?

"After a show [in Zurich], we were all sitting down in the dressing room and Uzi was like, 'I'm about to drop some songs. I'm going to drop them on SoundCloud.' "

This is the moment before @LILUZIVERT released "XO Tour Life." S/O to @DJPForReal https://www.revolt.tv/2019/4/23/20823559/tour-tales-dj-pforreal-talks-lil-uzi-vert-learning-from-the-weeknd-stage-diving-and-his-new-album