What endearing artist is so considered the romantic guru, entire cities are judged on the scale of how well in tuned they are with his music?

What was one Martin Luther King's favorite anthem's to march too during the civil rights protests? 

What was one of the biggest R&B songs ever from a movie of the same name?

Endless Love

What essential classic Sam Cooke song initially tanked on the Billboard charts but is widely considered his most endearing song ever?

What R&B/Pop classic is largely considered the 'Wedding Song'. 

We Belong Together

After a highly successful career as a playboy heart throb who redefined themselves with a politically conscious masterpiece? 

What Cincinnati group has one of the most cherished R&B love ballads of all time that peaked @#4 on Billboard's Hot R&B but stays #1 on many personal lists?