As many of you already know, Avicii had to get surgery this weekend and isn’t playing at Ultra. Initially, it was known that he had abdominal pain caused by his gallbladder but, once arriving at the hospital it was discovered that on top of a “sick” gallbladder as Avicii put it — he also had a ruptured appendix. Both procedures are not too intensive. Now, he is out of surgery and in recovery. He should be okay and ready to continue his US tour within a week or so (According to WebMD).