tweets range from humor to sadness
the pop star sang 'Imagine,' 'Like a Prayer' and more
singer thinks the two musicians are 'very different'
Madonna, Anderson Cooper among star donors
the singer jokingly begged voters to support the Democratic nominee
Salim Gauwloos revisits landmark film on its 25th anniversary
58-year-old singer takes a stand against hunting
Fundraiser brings together two LGBT icons
Material Girl danced on table at Havana restaurant
David Bowie, Madonna, Prince and more honored