"A statement released last week outlined that the late artist's family had ".decided not to keep the music locked away - instead they wanted to share it with his fans all around the world".
The single is the first look at the upcoming album, set to be released in June.
Blacc said: "I feel like 'SOS' was a song that was probably ahead of its time for when he wrote it".
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Producer, Avicii, sadly died in April 2018, after several health issues, including acute pancreatitis.
According to the latest press release, the Swedish musician had a new album on the verge of completion days before his death.
Last week, Universal Music announced it would be releasing a posthumous album of Avicii music, titled TIM. The songwriters that Tim was collaborating with on this album have continued the process to get as close to his vision as possible.
"He had a completely different way of playing piano and keyboard".
The accompanying video shows a dark background, and touching messages and memories from some of Avicii's fans. The song is centered on electric keyboard notes that create the flawless base for Aloe Blacc's bellowing vocal ability. "Tim's fingerprints are literally across the entirety of 'SOS'". "To give people the words and to be able to say, 'I need help'". Proceeds of this album will go towards the Tim Bergling Foundation, which vows to help those suffering from mental illnesses.