I haven't been to many concerts, but I really like the music. I like so much the Latin american music; specially chilean music (Style music as folk rock, indie, "trova", something like ballads... yes, it can be, etc.) 
One of the concert that I went and where were some of the greatest representatives of the Chilean and Argentine rock it was "Cristal en vivo" or better known as "El Abrazo", this represents the hug between Chile and Argentina. The concert was on December 2011 in the Parque O'higgins. 
Some of the artists who were and that I like are: Andres Calamaro, Charly García, Vicentico, Spinetta, Los tres, Bersuit Vergarabat, Intillimani, Banda Conmoción ... uuf! I think that I'll never end. 
I remember that day, it was very rare, so hot in the morning, and then the day was clouded, in fact, there was rain in the afternoon, but the adrenaline it was more!!! (ooh yeah!) 
The concerts that I recognize that I missed was the Radiohead and Silvio :(