Yes, in general, the names of musicals are italicized in fiction. This is a common style convention to distinguish the title of a specific work, like a musical, from the rest of the text.
No. While it is a common convention, not all fiction follows this strictly. Some less formal or more experimental forms of fiction might not italicize musical names.
Yes, they should. Italicizing business names in fiction can help to distinguish them from the regular text. It gives a visual cue to the reader that this is a specific name of a business entity, much like how we italicize book titles or foreign words. This can add a sense of formality and importance to the business name within the fictional context.
Not always. Usually, it's a matter of style and the author's choice. Sometimes italicizing can add a certain effect, but it's not a universal requirement.
In fiction writing, it's a common practice to italicize the names of books. This visual cue makes it clear that they are specific titles and adds a touch of clarity and professionalism to the writing.