The singers have clashed in the past
The two music icons have never been close
Soul legend transcended erratic chart stats, uneven musical output
The pop star's speech was more about the start of her own career
The set included the unreleased song 'Beautiful Game'
The pop diva is in Portugal recording new music
the pop star gets reinvented
The legendary Vanity Fair celebrity profiler is often artful, sometimes tactful
artists chosen include Lady Gaga, Diana Ross, Madonna
the Broadway legend got critical of the singer's 'Evita' performance
