Released on 10 November 2014, it features tracks the band had "forgotten about" with vocals from original lead singer Freddie Mercury.

Speaking on The Chris Evans Breakfast Show in September 2014, May revealed that the band had initially found it impossible to complete the track and that several different versions of the lyrics were written to make it easier for Mercury to sing.

An alternative remix by William Orbit was released in November 2014 as a single in the UK to raise money for Product Red, an initiative founded in 2006 by U2 lead singer Bono for the purpose of engaging the private sector in raising awareness and funds to help eliminate HIV/AIDS in Africa.

On that occasion, they had used his songs "Made in Heaven" and "I Was Born to Love You", as well as the unreleased solo recording "It's a Beautiful Day".

When it became apparent that there was not enough quality unreleased Queen material to make a new full studio album, May and Taylor decided to utilise the same tactics.

Written by Mercury and Giorgio Moroder, "Love Kills" was originally recorded for the band's 1984 studio album The Works, but was ultimately rejected.

It was then reworked as a Mercury solo track for inclusion in Moroder's 1984 restoration and edit of the 1927 silent film Metropolis.

Speaking on The Chris Evans Breakfast Show, May revealed that he had always wanted to turn the song into a ballad, but had never done so before Mercury's death.

Mercury later went on to re-record "There Must Be More to Life Than This" for his solo album Mr. Bad Guy (1985), while Jackson recorded one of the other songs, "State of Shock", with his family band the Jacksons, with Mick Jagger of The Rolling Stones singing Mercury's parts (the song was released as a single in 1984, and later featured on the Jacksons' seventeenth studio album Victory, also released in 1984; this album's title was also that of the third Mercury/Jackson duet, but has itself never been released).

The version released on Queen Forever was produced and mixed by William Orbit, containing the original 1981 backing track recorded during the Hot Space sessions, and features Deacon on bass guitar.

Rather than simply being the "greatest hits", however, the tracks are mostly deeper cuts personally chosen by Taylor and May.