At ten or eleven years old, mine was Erasure at Birmingham NEC in 1989. It was the first time I'd ever had that feeling of "I just have to get tickets for this" that I still get today (i just badgered my parents and made the most of my sweet face) and it obviously made an impression. It was a spectacular show, visually and imaginatively, even from the very back row. Just to hear the difference between music performed live and the album - the transformation was massive.