No, but good question!
Book titles, movie titles, TV show titles, play titles, and music album titles should be underlined when used in writing.
Generally, no they are not.
Song Titles are put into italics.
That is correct. In MLA style, titles of books are italicized rather than underlined when citing them in text.
No they should not.
No.
Television shows and song titles are usually in quotes. Movies, plays and books are usually underlined; although movies can sometimes be italized. - Lalyn.
Book titles are italicized if possible. If not, they are underlined.
Yes, They Do...
titles
Titles of epics are italicized or underlined as they are 'stand-alone' works like books.
Titles of articles are placed in quotes, because they appear in a longer publication, and the title of the journal in which they appear is italicized or underlined. Titles of books usually underlined or italicized.