I arrived in Berlin on a Thursday night at 10 or so and went out for a beer at the nearest bar and music venue. I ordered a beer and started to read the program for the month of October. Interestingly, there was a gig every night. It has a large bar, lounge and small stage. Entrance is 3 euros which is certainly worth it.
Friday night after dinner in Hackescher Markt, we ended up in this bar, a concert hall with a smoking area. It seemed to be an old cabaret, with several areas and a stage. Many young people go there and the entry costs 5 €. The drinks are good prices in general. The concert was good. There are concerts almost every day for 3 or 5 € and there are plenty to choose from. It had a very cool, communist air. We notice that was in the GDR.