Website in Finnish plus English description - but easily understood by dates and names.
Excellent avante-garde and contemporary Finnish jazz FREE in a good bar called Juttutupa. I prefer the translation Rhythmic Dysfunction Club!
Located 1 km due north of Helsinki Railway Station
Directions: Tram 3b - 3 stops to the middle of big open market square.
Or walk from Rway station head north about 600m, over the water under Pitkasilta (Longbridge) and turn left at the far, northern edge of the large market area (bounded by major road). That is the Säästöpankkiranta street. Then 100 metres on LHS in the bar Juttutupa
Or take a taxi!