Just watching Pointless with Iron Maiden and Showaddywaddy singers teamed up…which inspired this topic!
I have seen Iron Maiden numerous times with all 3 singers, but my first ever live band was Showaddywaddy…don’t laugh, it was a birthday treat for my cousin in the 70’s! They were amazing live and having 2 drummers sounded brilliant! Romeo Challenger did a drum solo and it inspired my love of drummers to this day!
So what was your first live gig? Don’t be embarrassed! 
I think it was Lighthouse Family at Wembley Arena with a school friend.
Stereophonics. Legends.
Prince
(well the 1st real live band saw lots of tributes before that)
S Club 7 
Wet wet wet 
Take That as a five piece. Seen them as a 5, 4 and 3 man band
The Jam : Sheffield Students’ Union
Pink Floyd at Leeds Poly around 1967 ish.
steps ! I also saw them a couple of years ago as well
Alice cooper. Joan Jett and motorhead
Lady Gaga!
Too cool!
Level 42
Three days grace
2nd band was then jerico
Prodigy - Brixton Academy. Took days for my hearing to recover, but it was well worth it! Amazing 
I envy you! A lifelong Jam fan here, but by some accident of fate I never got to see them live.
My first live band was Soft Machine at the Philharmonic Hall, Liverpool, 1971. I was only 13 so my elder brother had to go with me, poor sod - he hated their music! 
Next one I can remember after that was the Sensational Alex Harvey Band - and they were! 
It was an eye opener for many reasons. Me and my mate were the only ones drinking beer I think!
But they were one of the best gigs I have seen.
I think Placebo was the first proper band I saw live shortly after starting Uni.
My home city used to have lots of smaller music venues though and I’d been to loads of great gigs at them throughout my teenage years.
Seen Maiden a few times now @WillC , I think that is a Pointless I will have to watch soon on iPlayer!