Oooh, I've been looking for a concert thread for a while now. I honestly can't remember all the concerts I've been to so far, but I'll try.
Alicia Keys (Berlin, ~2004 for The Diary Of Alicia Keys)
Alanis Morissette (Berlin, 2007 or 2008 for Flavors Of Entanglement)
Beyoncé (Berlin, 2009, I Am... Tour)
Coldplay (Berlin, 2009, Viva La Vida Tour)
Frida Gold (Berlin, 2011 for Juwel)
Justin Timberlake (+ Black Eyed Peas) (Justified Tour)
Kelis (Berlin, 2010 for Flesh Tone)
Kylie Minogue (Hamburg, 2005 Showgirl Tour)
Kylie Minogue (Berlin, 2008 X Tour)
Kylie Minogue (+ Frida Gold) (Berlin, 2011 Aphrodite Les Folies)
Lady GaGa (+ Gary Go) (Berlin, 2009 The Fame Ball Tour)
Madonna (+ Robyn) (Berlin, 2008 Sticky & Sweet Tour)
Maroon 5 (Berlin, 2005 for Songs About Jane)
Medina (Berlin, 2011 Welcome to Medina Tour)
P!nk (Berlin, 2006 I'm Not Dead Tour)
P!nk (Berlin, 2009 Funhouse Tour)
Pet Shop Boys (Berlin, I guess it was in 2009 or 2010)
Robyn (Berlin, 2011 for Body Talk)
I think I forgot some but these are the ones I remember now.
And what is still to come is...
Janet Jackson (Berlin, 2011 Number Ones: Up, Close & Personal Tour)
Maroon 5 (Berlin, 2011 for Hands All Over)
My friend also wants to take me to Take That in Hamburg as she's got a spare ticket from a friend who can't go.