Canadian artist is 'half-way through' follow up to 2012's 'Visions'
The singer's latest track 'Go' divided fans
The track was originally written for Rihanna and debuted earlier this summer
The singer had been nominated to perform the ice bucket challenge by Richie Hawtin
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