"We Must Be Crazy" is by Belgian singer-songwriter Milow, from his 2014 album Silver Linings.
http://en.wikipedia.org/wiki/Milow
http://en.wikipedia.org/wiki/Milow
Text to this post, obtained from this song's Wikipedia page, has been slightly modified and made available here under the Creative Commons Attribution-ShareAlike 3.0 Unported License. (CC BY-SA 3.0)
https://creativecommons.org/licenses/by-sa/3.0/