Queen performs poignant cover of 'Imagine' in tribute to John Lennon and Freddie Mercury

In a recently rediscovered video, Queen fans were treated to a stunning cover of John Lennon's 'Imagine' during their Hyde Park show in 2005 with former Bad Company singer Paul Rodgers.

When the legendary rock band added the song to their setlist as a tribute to the heartbreaking London bombings - which killed over 50 people - Brian May also paid a touching nod to the legacy of the late Beatles star and their late frontman, Freddie Mercury.

"I find myself kind of lost for words," guitar legend May tells the crowd in a video from the concert.

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"We've decided we’d like to do something special for this particular night because a lot of things have changed.

"A lot of stuff is happening and rather than words, we'd like to sing you a song written by probably the greatest rockstar of all time, next to Freddie," he added launched into a poignant rendition of the iconic 1971 song.

Queen has continued to perform live since Mercury died of AIDS-related pneumonia nearly 30 years ago.

Following their collaboration with Rodgers, they teamed up with American Idol pop star Adam Lambert.