Based on the context and the answer, generate a question. 

Context: I ' m glad we 're back in contact . We had a good time , we reminisced back to when were roommates , and as the ultimate throwback we saw Bloc Party together , the way we did three years ago when we were young and innocent . And as my final penance ?

Answer:

They went to a rock concert .



What type of concert did the narrator go to ?