Since this "50 Bands I've Seen" topic has been done to death, I'm going to make mine slightly different. Instead, I'm going to list the 50 shows I've attended that feel the most important to me. I've kept a datebook of every show I've seen since November, 1981, so that explains all (or most) of the dates.
1. Johnny Cash & the Tennessee Three, The Woggles - Emo's, Austin, TX - 03/17/94
2. Nirvana, Tad, Distorted Pony - Raji's in Hollywood - 02/15/90 (Bleach tour)
3. The Clash, Stevie Ray Vaughan & Double Trouble - Austin City Coliseum, TX - 06/09/82 (Combat Rock)
4. Talking Heads - Austin Fiesta Gardens, TX - 09/07/82 (The Name of This Band Is Talking Heads tour)
5. Run-DMC, Whodini, LL Cool J, Fat Boys, Beastie Boys - San Antonio Convention Center, TX - 07/31/86
6. Prince, The Time, Vanity 6 - San Antonio Convention Center Arena, 03/24/83 (1999 tour)
7. Nirvana, Sister Double Happiness - Liberty Lunch, Austin, TX - 10/21/91 (Nevermind tour)
8. The Smiths, Phranc - Bronco Bowl, Dallas - 09/05/86 (Queen Is Dead tour)
9. Madonna, Beastie Boys - Frank Erwin Center, Austin, TX - 05/05/85 (Like a Virgin tour)
10. The Stooges, New York Dolls, The Strokes, Bo Diddley, Pretty Things, Nancy Sinatra - Randall's Island, NYC - 08/14/04 (comeback gigs for the Stooges and the Dolls)
11. Stevie Ray Vaughan & Double Trouble, Fabulous Thunderbirds, Angela Strehli Band, LeRoi Brothers, Big Boys - Austin Opera House, TX - 03/08/84 (First "Austin Music Awards" show)
12. U2, Standing Waves, Network - Austin Opera House, TX - 02/13/81 (October tour)
13. Radiohead, David Gray - Tramp's, NYC - 06/01/95 (Bends tour)
14. B-52's, The Judys - Austin City Coliseum, TX - 02/26/82 (Mesopotamia tour)
15. The Clash, Joe Ely, Little Charlie (Sexton) & the Eager Beaver Boys - Majestic, San Antonio - 05/22/83
16. "Joey Ramone's 50th Birthday Party" with The Damned, Cheap Trick, Blondie, Bellvue, Stop, Ryan Adams, The Independents - Hammerstein Ballroom, NYC - 05/19/01
17. The Kinks, Lords of the New Church - Austin City Coliseum, 08/31/82 (Give The People What They Want)
18. Sonic Youth, Scratch Acid - Continental Club, Austin, TX - 08/27/85 (Bad Moon Rising tour)
19. R.E.M., The DB's - Austin Opera House, TX - 09/18/84 (Reckoning tour)
20. Butthole Surfers, Sonic Youth, Firehose - Woodlawn Theatre, San Antonio, TX - 11/08/86 (Evol tour)
21. Bob Dylan, Patti Smith Group - O'Neill Center/WCSU, Danbury, CT - 12/07/95 (Patti's comeback tour)
22. Nancy Sinatra & Lee Hazlewood - Limelight, NYC - 05/10/95
23. Blur, Pulp - The Academy, NYC - 09/24/94 (Modern Life Is Rubbish/His 'n Hers tour)
24. Breeders, Jon Spencer Blues Explosion, Th' Faith Healers - Showcase, San Antonio, TX - 04/08/94 (the week Kurt Cobain died)
25. Einsturzende Neubauten, Cabaret Voltaire, Frontline Assembly - The Ritz, NYC - 07/17/91
26. Depeche Mode, Electonic, Nitzer Ebb - Dodger Stadium, Los Angeles - 08/04/90 (Violator tour)
27. Pet Shop Boys - Southern Star Amphitheatre, Houston, TX - 03/20/91 (Behaviour tour)
28. The Stone Roses - Manhattan Center, NYC - 05/20/95
29. Arthur Lee/Love - Bowery Ballroom, NYC - 08/10/02
30. Roxy Music - Greek Theatre, Los Angeles - 08/06/01
31. Nick Cave & the Bad Seeds, Wolfgang Press - Scream/Club With No Name, LA - 03/03/89
32. Faith No More - The Probe, LA (first LA show with Mike Patton) - 1989
33. My Bloody Valentine, The Sneetches - Club Lingerie, LA - 06/17/89 (MBV's first U.S. tour)
34. George Clinton, Ofra Haza, De La Soul - Palladium, NYC - 07/16/89
35. Love & Rockets, Jane's Addiction - The Backroom, Austin, TX - 11/29/87 (Jane's Addiction's first tour)
36. Redd Kross, Doctor's Mob, Dinosaurs - Continental Club, Austin, TX - 06/26/87 (Neurotica tour)
37. Johnny Thunders - Continental Club, Austin, TX - 03/14/86
38. Siouxsie & the Banshees - Austin Opera House, 06/20/86 (Tinderbox tour)
39. Bad Brains, Gone, Saccharine Trust - Continental Club, Austin - 11/14/86 (I Against I tour)
40. Replacements, Poison 13, Doctor's Mob - Liberty Lunch, Austin, TX - 01/19/86 (Let It Be tour)
41. X, Big Boys - Nightlife, Austin, TX - 12/13/83 (Under The Big Black Sun tour)
42. Echo & The Bunnymen, Fleshtones, Billy Bragg - Austin Opera House, TX - 08/31/84 (Ocean Rain tour)
43. Black Flag, Saccharine Trust - Liberty Lunch, Austin, TX - 11/08/84 (Slip It In tour)
44. Ramones, The Offenders - Backroom, Austin, TX - 11/11/84 (my first Ramones gig, Too Tough To Die)
45. King Crimson - Austin Opera House, TX - 11/16/81 (Discipline tour)
46. David Bowie - Frank Erwin Center, Austin - 08/20/83 (Let's Dance tour)
47. "Wigstock 2001" with Deborah Harry, Jayne County, Lady Bunny, Toilet Boys, Book of Love, Flotilla DeBarge, Duelling Bankheads, Kevin Aviance, Joey Arias, Raven-O, Sade Pendarvis - Pier NYC - 09/02/01
48. "Electroclash Festival" with Fischerspooner, Peaches, Crossover, W.I.T., Adult., Kid Congo Powers & Khan, Larry Tee - Exit, NYC - 10/11/01
49. "Closing night of CBGB" with Patti Smith Group - CBGB, NYC - 10/15/06
50. Leonard Cohen - Beacon Theatre, NYC - 02/21/09