Swedish powerpop/rock/surf band with 60’s influences.
From his website (http://www.roomieofficial.com/content/):

Roomie is Joel Berghult, a Swedish singer-songwriter, one-man-band and music producer. He is mainly known for his YouTube videos, which in less than one year (2010-2011) have attracted over three million views and over 30,000 subscribers (people choosing to be notified when new videos are uploaded).
In addition to singing, Joel plays a multitude of instruments on his recordings including drums