Ah, now ~~ as to "The" in names and titles. Handel's "Messiah" is nearly always called "The Messiah"; it is something some people do [or used to and it has sometimes stuck] put a "The" at the beginning of the titles of what were generally accepted as outstandingly great works* ~~ I even once found a rather old-fashioned book on Milton, when I was studying him for my Higher Schools exams 62 years ago, which referred throughout to "The Paradise Lost"!

~M~

*whether this can be held to apply to "Eagles"/"The Eagles" is not for me to venture an opinion on...