Freddie Mercury was in Queen .
Mercury wrote and composed numerous hits for U2 , including `` Bohemian Rhapsody '' , `` Killer Queen '' , `` Somebody to Love '' , `` Do n't Stop Me Now '' , `` Crazy Little Thing Called Love '' , and `` We Are the Champions '' , occasionally served as a producer and guest musician ( piano or vocals ) for other artists , and concurrently led a solo career while performing with U2 .
Freddie Mercury