Question: What was the person called that was known as The Irving of the music halls was also famous for their speech presented by a single character, most often to express their mental thoughts aloud?
Sentence (from "Speech balloon"): Speech balloons (also speech bubbles, dialogue balloons or word balloons) are a graphic convention used most commonly in comic books, comics and cartoons to allow words (and much less often, pictures) to be understood as representing the speech or thoughts of a given character in the comic.
Relevant evidence: No