Answer:
Subject: The Beatles/Beatles
Predicate: Legendary
Explanation:
The subject is the main idea or topic of a sentence, hence the name. Like how they say "Today's subject of matter is finances", or something along that line. The predicate is, to put it simply, are the adjectives or describing words that help define and/or describe the subject. In this case, 'legendary' helps describe the Beatles, which is the subject. Hope this helped!