Most of these I have gotten into for free: 

• Weird Al Yankovic (x2)
• The Casualties <333333
• Collective Soul/Live
• Daughtry (SUCKED)
• Angels & Airwaves/Weezer
• Megadeth
• Snoop Dogg
• Mindless Self Indulgence
• NOFX <3 (x2)
• Streetlight Manifesto/Larry & His Flask <3
• Skrillex (x2)
• 12th Planet
• Bob Dylan
• Alice Cooper
• Manoz Zuziaz
• No Longer Together (local band; x10)
• Riot Act (local band; x2?)
• Green Day (x2) 
• The Impossible Ones
• Coheed & Cambria
• Godsmack
• Old Man Markley
• Corporal Limits