There are many calm places not overcrowded and its no problem to find an empty playa if tu have patience, but in Visby (the biggest town) there are pubs, restaurants and clubes everywhere in the summer.
BWO (Bodies Without Organs) here with a video from their 2006 album called "Halcyan Days". BWO songwriter and member of the band Alexander Bard was former member of "Army Of Lovers" and also songwriter for Agnetha Fältskog of ABBA