Topic summary
Boss battle

Extracted from the Wikipedia article Boss (video games).
Characteristics
Boss battles are typically seen as dramatic events. As such, they are usually characterized by sometimes quite theatrical cutscenes before and after the boss battle and unique music. Recurring bosses and final bosses may have their own specific theme music to distinguish them from other boss battles. This concept extends beyond combat-oriented video games. For example, a number of titles in the Dance Dance Revolutionrhythm game series contain "boss songs" that are called "bosses" because they are exceptionally difficult to perform on.