Queen + Adam Lambert is a collaboration between the active members of the British band Queen (Brian May and Roger Taylor) and American vocalist Adam Lambert. As with all other Queen performances since 1997, longstanding bassist John Deacon has declined to participate in the project due to his retirement. This is the first long-term collaboration of Queen since the Queen + Paul Rodgers project ended in 2009. Like the previous project, it was made clear that Lambert would not be replacing Queen frontman Freddie Mercury, but rather that he would be featured with the band’s active members. The collaboration originated when May and Taylor appeared on American Idol in 2009 when Lambert was a contestant. They began performing occasionally in 2011, conducted a short European tour in 2012, and in 2014 announced a world tour, the Queen + Adam Lambert Tour 2014–2015 with dates in North America, Australia, New Zealand, Asia, Europe and South America. In the summer of 2016, the group performed several dates as part of a festival tour in Europe and several dates in Asia. The next year, the group announced a second worldwide tour scheduled for 2017 and 2018 and later announced a short United Kingdom tour for 2020.
Queen & Adam Lambert announced a 10-date residency at Park Theater in Las Vegas in September 2018. They also performed at the 91st Academy Awards on 24 February 2019 to celebrate Bohemian Rhapsody. They then closed out Global Citizen Festival 2019 on 28 September.