A long-forgotten song recorded by the legendary British band Queen featuring the late Freddie Mercury will be released in September, band members Brian May and Roger Taylor announced.

Along with Mercury, May, 74, and Taylor, 72, founded the rock band, best known for hits including "Bohemian Rhapsody" and "We Will Rock You," in 1970.

Speaking to Zoe Ball on Radio 2, Queen’s drummer Taylor said: "We did find a little gem from Freddie, that we’d kind of forgotten about."

He added: "It's wonderful. Actually, it was real discovery. It's from the 'Miracle' sessions (in the late 1980s), and I think it’s going to be out in September."

Mercury died from AIDS-related complications in 1991 at the age of 45.

Speaking about how the lost track was discovered, guitarist May said: "It was kind of hiding in plain sight.

"We looked at it many times and thought, 'Oh no, we can’t really rescue that.' But in fact, we went in there again and our wonderful engineering team went, 'OK, we can do this and this.' It's like kind of stitching bits together."

He added: "But it's beautiful. It's touching."

Taylor went on to describe the upcoming release as "a very passionate piece."

May and Taylor performed as part of Queen Elizabeth II’s Platinum Jubilee celebrations at Buckingham Palace on Sunday during the "Platinum Jubilee Party At The Palace."

Along with Adam Lambert, the band’s long-term stand in for Mercury, Queen performed a number of their biggest hits including "We Will Rock You" and "Don’t Stop Me Now."

Queen and Lambert, 40, are also currently on a European tour.