There's going to be a free festival in Helsinki this weekend (10.-12.6.) There will be plenty of artists and wide range of different music available. The main place for the festival is in Koffin puisto (Koffari) and it's going to be on saturday. On friday and sunday there will be music available in Modern art museum, Kiasma, and M bar Terrace, which is very close to Kiasma in Lasipalatsi.Also on saturday there will be design market in Lasipalatsi, so it's going to be good weekend in these hoods!
More info & map can be found here.
Sounds like music!