Queen has issued a previously unheard track called 'Let Me In Your Heart Again' via iTunes exclusively for the (Coca-Cola) RED campaign, which benefits the Global Fund to fight AIDS, tuberculosis and malaria.

Mixed for release by William Orbit, the track features vocals from the late Freddie Mercury, who died of AIDS-released illness in 1991.

“It’s been 23 years since the world lost our beloved Freddie Mercury,” Queen guitarist Brian May said in pre-release materials. “We’ve made extraordinary progress in the fight against AIDS in that time. But we cannot simply rest on the fact that the treatment is available. We must ensure that it is provided. (Fellow remaining Queen member) Roger (Taylor) and I are proud to lend this rediscovered song to the RED campaign, in the hope that Freddie’s powerful voice can inspire the world yet again.”

'Let Me In Your Heart Again' arrives amid of flurry of unreleased music from the band's Mercury era. 'Queen Forever,' due on Nov. 10, also includes an updated version of 'Love Kills.' Both songs were out-takes from the 1983 sessions for 'The Works' album, with new contributions from May and Taylor. 'Queen Forever' includes 'There Must Be More to Life Than This,' a Mercury duet with Michael Jackson, as well.