Relatively simple one to start off the week. What could possibly be the connection?
Hot chocolate, black and white TV, iPod Classic, A New Hope, acoustic guitar – all are instances of retronyms – “A retronym is a type of neologism coined for an old object or concept whose original name has come to be used for something else, is no longer unique, or is otherwise inappropriate or misleading.” For e.g., all televisions were black and white until colour televisions came along – so the term B & W television wasn’t coined until the arrival of colour TVs.
Answered by Zizzyphus and Ivan. (Nice guess by Murali.)