Taylor Swift fair tour x3
Taylor Swift Fearless tour x3
Taylor Swift Speak Now tour x4
Taylor Swift Red tour x2

The Band Perry
Blake Shelton
Justin Moore
Lady Antebellum
Kacey Musgraves
Miranda Lambert x2
Dierks Bentley
Avril Lavigne
Justin Bieber
Carly Rae Jepsen
Hunter Hayes
Ed Sheeran x3
Ke$ha
Carrie Underwood
Demi Lovato
Little Big Town

From what I can remember.

Monster Ball - July 14th, 2010 and March 12th, 2011
Marina and the Diamonds - May 17th, 2013

Upcoming:
Ke$ha - June 2nd, 2013
Panic! At the Disco/Fall Out Boy - September 11th, 2013

0.

Cage The Elphant (2012)
The Killers (2012)
Gaga (2013)
Imagine Dragons (2013)
Muse (2013)
Marina and The Diamonds (2013)

And I was supposed to see The Neighbourhood today.

taylor swift-2011
katy perry-2009/2012
boys like girls-2010
colbie caillat-2007
simple plan-2012
metro station-2008
the click five-2007
avril lavigne-2012
pussycat dolls-2009
cobra starship-2010/2012
the used-2012
dashboard confessional-2012
the cab-2012
rihanna-2008
chris brown-2008
jason castro-2010
paramore-2010
alicia keys-2005
all time low-2011/2013
forever the sickest kids-2012
a rocket to the moon-2012
the summer set-2012
the maine-2011/2012
there for tomorrow-2012
william beckett-2012
every avenue-2012
we the kings-2011
never shout never-2011
good charlotte-2011
david cook-2009
david archuleta-2009
mayday parade-2012/2013
the pretty reckless-2012
the wonder years-2012
avastera-2012
marianas trench-2012
a skylit drive-2012
we are the in crowd-2012/2013
this century-2012/2013
yellowcard-2013
a+ dropouts-2012/2013
the ready set-2012
the downtown fiction-2013
allstar weekend-2013
set your goals-2012
megan nicole-2013
panic at the disco-2008
we came as romans-2013
anberlin-2013
radio drive by-2013
red jumpsuit apparatus-2013
tonight alive-2013
kelly clarkson-2010
the fray-2012
foster the people-2012
motion city soundtrack-2013

Pussycat Dolls twice
The Script Twice.

Delta Goodrem - The Visualise Tour
Delta Goodrem - An Evening With...
Delta Goodrem - Album launch concert
Delta Goodrem - Christmas Eve concert
Delta Goodrem - Believe Again Tour x 3
Delta Goodrem - Top Of The World show
The Police with Fergie as the support act
Rod Stewart
Bon Jovi
Lily Allen
Robbie Williams
Cher - 2005 The Farewell Tour
Pink - Funhouse tour
Beyonce - I Am Tour
Britney Spears - Circus tour
Lady Gaga - The Monster Ball
Lady Gaga - The Born This Way ball x 12 (apart from Perth, I went to every Aussie date )
One Direction
Justin Bieber
Coldplay
Jennifer Lopez - Dance Again Tour

I've got Pink and Rihanna coming up later this year