More from Queen

Queen, David Bowie and Annie Lennox's powerful 'Under Pressure' performance in tribute to Freddie Mercury

Queen, David Bowie and Annie Lennox's powerful 'Under Pressure' performance in tribute to Freddie Mercury

The footage, posted by Queen's official YouTube account, sees Adam Lambert singing with Brian May and Roger Taylor as the trio warm-up before a concert.

Queen and Adam Lambert harmonising in unseen backstage video is incredible

In the clip Freddie can be seen practising the traditional Hungarian folk song 'Tavaszi Szél Vizet Áraszt' that he will later sing live in front of 100,000 people at the Budapest concert.

Queen: Freddie Mercury and Brian May's private hotel jam session from 1986 is magnificent

Video footage of John Deacon's last ever public appearance as a member of Queen was filmed in 1994 alongside Brian May and Roger Taylor.

Queen: Watch John Deacon's touching final message to fans before he quits the band - video

Footage shows Freddie Mercury singing a Hungarian folk song to Mary Austin in 1986

Queen: Freddie Mercury sings to 'soulmate' Mary Austin in touching footage from 1986 - video

Freddie Mercury and Michael Jackson recorded a handful of duets, only one of which ever made it officially to the light of day.

Michael Jackson and Freddie Mercury's electrifying long-lost duets are heart-wrenchingly good

Ten-year-old George Elliot wowed viewers of The Voice Kids with an incredible cover of Queen's 'Radio Gaga'

The Voice Kids: Boy, 10, challenges Freddie Mercury with astounding version of Queen's 'Radio Gaga' - video

Video footage of Queen's first ever known recording has resurfaced after nearly 40 years.

This footage of Queen's first ever recorded performance is sensational - video