What was your great moment, when you first “stepped out” (Latin: progressus) and went forth, advancing into prog?

Can you recall those great moments when you proceeded to access prog’s transcendent “worlds within worlds”… to go wheeling through the galaxies of “genres within genres”?

I’ll never forget the first time I heard “Xanadu”, especially when it all came together with Alex’s outro solo…

Nota bene: That solo kicks in below at 8:20.