Song was originally written for Rihanna before being rejected
Singer unhappy about appearing to condone use of hard drugs
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