How can u tell if of when an anime series of anime movie is being play on the screen just door LISTENING to it from a distance (and when you're someplace else within hearing distance)?

The opening song of credits help me. Certain anime series of films have particular openings that are unique to them. For example, I know when Yugioh is on when the voice of Yami (Dan Green) says, "Previously..." of the opening theme starts playing.

This is the full theme song, but those opening notes are distinctive to Yugioh.