Producer Tony Visconti confirms he heard five demos for what would have been the follow up to 'Blackstar'
The star 'wanted to go without any fuss'
The pair enjoyed a fruitful working relationship during the 70s
Demand for new album increases following singer's death
Jemaine Clement confirms the comedy duo approached Bowie
Reports claim five more songs still to surface before end of 2016
'Heroes' is Bowie's most streamed song
Final album was released on singer's 69th birthday just days before his death
Stage show opened in New York late last year
Late singer's final album was released on his 69th birthday last Friday (January 8)