But on rare occasions, as happened this week (Aug. 27) in Sydney, Australia, those giant tours meet and create something special. The new incarnation of Queen, featuring Adam Lambert in lieu of deceased frontman Freddy Mercury, played the first of two nights in the Australian cities Allphones Arena, and were joined on "Another One Bites the Dust" by none other than the ARTPOP queen herself, Lady Gaga.

Wearing a giant Brian May-like afro wig adorned with appropriate crowns, Lambert easily out-sings the diva, but she provides the song with some flare that the band's re-imagining just couldn't pull off alone.

Lady Gaga's artRAVE: The ARTPOP Ball plays Sydney on August 30, and Rolling Stone notes that Gaga and Queen/Lambert have a long history, with Gaga co-writing "Fever" for Lambert's debut solo LP and Queen guitarist Brian May contributing his legendary skills to the single, "Yo� and I."