A 90-second snippet of the song was previewed last week
Track will feature on singer's new album 'Matangi'
Singer also hints that the documentary about her is back on
Her fourth album will now come out the first week of November
Singer vents her frustration at Interscope on Twitter
The untitled track was performed at Montreal's Metropolis venue
Steve Loveridge says he would 'rather die' than finish work on the movie
The song was first played on radio earlier this week
She will be releasing her fourth album 'Matangi' this autumn
She explains that finishing her new album 'Matangi' has not been easy