Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Who released the albums Sentimental Journey, Goodnight Vienna, Bad Boy, Old Wave and Vertical Man between 1970 and 1999?
vertical man

Who succeeded John Major as leader of the UK Conservative Party?
conservative party

Aaron Copeland wrote a ballet about which American folk hero?

aaron copeland