Mr Saxobeat Alexandra Stan Download 'Mr Saxobeat' on iTunes
'Fireflies' is Owl City's debut single, it's already topped the chart in the US, Australia, Denmark and Netherlands.
The song was released in the US in July 2009 and has been huge, now it's due for release in the UK and is set to be huge here in 2010.
The man behind Owl City is Adam Young, who started his one-man-band in his parents' Minnesota basement in 2007.
Take a look at the video for 'Fireflies' and let us know what you think below...