Producer and artist Finneas O'Connell has released a deluxe version of his Blood Harmony EP, featuring the original seven tracks, 'Break My Heart Again' and a "1964" version of 'Let's Fall in Love for the Night'.

Entitled 'Let’s Fall in Love for the Night (1964),' Finneas has stripped the track down to its bare essentials for a modern lounge atmosphere.

Channeling Frank Sinatra, the brother and producer mastermind of Billie Eilish sings over a marimba and snap tracks to completely transform the song.

“When I was originally producing this song, it took me down two different directions," Finneas said of the new version.

"One inspired by the rhythms I loved in Outkast and Gorillaz songs, which became the original production, and the other, which became this," he adds.

"A production inspired by the vinyl loved and listened to throughout my childhood. I wanted to make a lullaby version and give it to the people.”

Addressing the fan question of what the EP’s title could mean, he confirmed that it's linked to his special relationship with his younger sister Billie.

“I would love for this title to remain ambiguous to listeners and for everyone to be able to imbue it with their own meaning and justification,” he said.

“The most common use of the term ‘blood harmony’ is an English expression for what it sounds like when siblings sing together, that biologic chemistry — I think that speaks for itself.”

Eilish recently dropped the Finneas-produced song 'My Future' on her brother’s birthday.

Listen to Finneas' 1964 version of 'Let's Fall in Love For The Night' below: