All proceeds from the track will be donated to support the legal fight against foreign-owned salmon farming operations in Iceland brought by residents of Seyðisfjörður. The song was produced by the two artists along with Sega Bodega.

In a statement posted on her Instagram, Björk shared: "this is a 25 year old song of mine i wrote and programmed inspired by a dancehall beat (the grandmother of reggaeton). rosalia's experiments with the genre and her incredible voice made her an obvious guest for the song. i feel blessed she said yes and she and her team are giving their work and all the profits to this battle. i think somehow there is an elegant resonance between the fact that both of our voices are the same age on the recording."

"We have a team of people from the biggest environmental groups in Iceland with lawyers that will take on other open net pen fish farming cases, I would like to thank them all for all their hard voluntary work," she continues. "Industrial salmon farming in open net pens is horrid for the environment. the farmed salmon goes through immense suffering, and it causes severe harm for our planet. this is an extraordinarily cruel way to make food. the fight against the open net pen industry is a part of the fight for the future of the planet."

Speaking to Pitchfork, Björk revealed that she wrote most of the song between her 1997 LP, Homogenic, and 2001’s Vespertine, but she lost track of the original tapes for two decades. She re-discovered the track after seeing the word “oral” on TV while on tour in Australia earlier this year.