Oslo, Norway
Be sure to check their event calendar, every week they have concerts with a variety of international and Norwegian bands and/or DJs. Each Sunday there is a free jazz/blues/soul concert. Walk up the river from the centre and you'll find it. Old factory style houses with lots of graffiti.
Listen to the audio guide for Blå og Indigo Free on WIP — starts by itself when you arrive, even with the screen off