Musician and fan of HBO series also met writer, George RR Martin at San Diego event
The Canadian electronic artist contributes guest vocals to 'Take Me Away'
The song is a 2009 collaboration with Devon Welsh of Majical Cloudz
The track was reportedly originally written for Rihanna
One of the trio of songs was written for Rihanna but was rejected by the star
Canadian artist is to premiere the track in New York this weekend
US rapper recently signed Canadian artist to his Roc Nation management roster
Canadian musician reveals prospective release date with fan on Twitter
Singer joins rapper's entertainment company
Songs by Paramore, Mariah Carey, Portishead and MIA also make the list