According to Wikipedia, Queen are the only band in which every member has composed more than one No. 1 single.
A thread I found on reddit lists the songs as:
Freddie Mercury – Don't Stop Me Now, Bohemian Rhapsody, Somebody To Love, Crazy Little Thing Called Love and We Are The Champions.
John Deacon – Another One Bites The Dust, I Want To Break Free and You're My Best Friend.
Roger Taylor – Radio Ga Ga and A Kind Of Magic, as well as These Are The Days Of Our Lives.
Brian May – Fat Bottomed Girls, We Will Rock You, and Who Wants To Live Forever?
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