Madonna pays tribute to Adam Yauch: 'Integral to musical revolution'
The Beastie Boys rapper, who fought a three-year battle with cancer, was credited with leading a "musical revolution" by the pop superstar.
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Madonna, who was supported by Yauch on tour in 1985, said that the rapper was "integral to the musical revolution that was happening at the time".
The 53-year-old also emphasised her sadness, asking God to bless his family.
MCA's death has prompted similarly heartfelt reactions from the likes of Boy George, Snoop Dogg and will.i.am.
The hip-hop icon won three Grammy Awards with his group.
Coldplay performed a tribute to Yauch during a concert in Los Angeles on Friday (May 4).
Photo gallery: Adam Yauch's life and career in pictures:
The Beastie Boys in the 1980s - Ad-Rock (Adam Horovitz), Mike D (Mike Diamond), and MCA (Adam Yauch)
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Copyright: Rex Features Everett Collection