13rd of Feb 15:

The number 1 comes originally from Jamaica. It is Cheerleader by OMI that grabs the crown due to the remix by Hamburg DJ Felix Jaehn.
It is a similar situation like last time a Jamaican artist was number 1. In 2008 it was Shaggy who had the honour being number 1 for a week with Feel The Rush. The song was the official anthem of the European Football Championship so the release was officially credited to Trix & Flix the two mascots of the championship.