An Epic Riff is that piece of instrumental flair that lays the foundation of an entire song, and is immediately recognizable from a small fragment, even by people who don't generally follow the type of music it is from (even if they can't identify which song it's from). For example, even people who are not fans of rock will probably recognize "In A Gadda Da Vida" by Iron Butterfly (even if they [...] [tvtropes.org]