Lady Gaga becomes first artist to sell over 20 million digital singles

The 20 Best Lady Gaga Songs of All-Time

Lady Gaga stuns with 'Sound of Music' tribute at Oscars

Lady Gaga Ft Beyonce - Telephone (Remixes)

Lady Gaga - Telephone ft. Beyoncé (Behind the Scenes)

Lady Gaga (Ft. Beyoncé) – Telephone

Lady Gaga – Fashion!