Brian May has praised Adam Lambert's voice as Queen continue rehearsals.

The band are currently in London with the vocal powerhouse as they prepare for their upcoming North America tour.

It seems to be going swimmingly, with guitarist May taking to Twitter to update fans on their progress.

When responding to his followers about their song ideas for the tour, May said:

"Ta! You guys sending great song ideas. Thanks! I'm listening! Adam is also full of great ideas...this tour will be a little different.

"And @adamlambert is in crackin' form! What a voice!!! What a bloke!!! Bri."

Queen and Adam Lambert are also due to head to Asia and then Australia after their North America tour concludes in early August.

Watch Queen and Adam Lambert perform together below: