Track will appear on group's upcoming album 'A Head Full of Dreams'
New song heralds superstar's first appearance in more than a year
Diplo, Katy Perry, Miley Cyrus and Chris Rock all drop by singer's epic penthouse party
Singer also unveils the touching tribute's homemade video on her husband's new streaming service
Lunch with Lady Soul: A revitalized Aretha speaks out
The new song "Ring Off," in which the singer tackles the issue of divorce, is also available for streaming
New clip for anticipated movie mixes footage of steamy seduction and erotic exposition