Musical Ds: I am a musician, a prolific catwriter, & a humble genius, who am I?

Questions

Cartoon Trivia - How many freckles did Howdy Doody have?

Cartoon Trivia - The maiden names of which two cartoon characters are Slaghoople and Mcbricker?

Cartoon Trivia - What are the names of Donald Duck's nephews?

Cartoon Trivia - What city do Batman and Robin patrol?

Cartoon Trivia - What expression did Clark Kent's newspaper boss like to use?