Your first concert was to see who and when?

The Blues Magoos (I'm Never Going Back to Georgia) in the Spring of '69 at the Ekman Civic Center in Old Greenwich, CT. I was 17 and a high school junior.

My first was a Battle of the Bands show at the then Charlotte Coloseum with The Grass Roots as main attraction.... don’t remember the others. I went with my ’girlfriend’, shapparoned. 

First real concert was The Doobie Brothers @ Cameron Indoor Stadium on their "Vices" tour.

aside from high school symphonic band concerts I played in [contrabass clarinet], the first "real" concert where I wasn't a player, was back in the summer of '83 at seattle's central tavern where blues harmonica player charlie musselwhite and his band were blowin' the walls down, almost literally. the speakers were refrigerator-sized, and the volume was so loud that my drink sloshed in its glass as I sat right up front and center. my hearing has never been quite the same since. shoulda wore industrial hearing protection. young and sorta dumb about it. 

@jrod68 That's cool!  I was 16 or 17 years old.  We were just old enough to drive.

Around 1983, I saw AC/DC in Omaha.  Their Hells Bells tour.  It was awesome, but really loud.  My ears rang for days..... I've read that it was one of the loudest tours in concert history. 

Lynyrd Skynryrd Capital Theater Passaic NJ 1976. Warm up bands 38 Special and Atlanta Rhythm Section.

I had tickets for Madison Square Garden in 1977 but the plane went down after the 4th show of that tour.