Avicii is an insanely talented house/trance music artist from Sweden. He has multiple names on stage, but his most common two are: Avicii (stage name) and Tim Berling (his real name). If you look him up on YouTube, you will come across some fantastic songs. His most famous ones are: Le7els (Levels) and Seek Bromance. YouTube has made playlist of videos that showcase some of his best hits. To check out his videos just click the picture.
Source: Personal Interest
His Site: http://www.avicii.com/