I dont think anyone knows about them,they are swedish ,they were called The FOOO ,then The FOOO Conspiracy (it was Felix,Oscar,Omar and Olly)..but Olly left band so now they are FO&O ,
they are competing in Melodifestivalen (swedish competiton) for who will go to Eurovision.
about them :

https://en.wikipedia.org/wiki/FO%26O

video from Melodifestivalen
https://youtu.be/yU2tAfDt6lA

one of my fav songs called My girl
https://youtu.be/6lL2oE48J8w

vk page
https://vk.com/fooofamily