Sox
Avoiding The Swan Song
^^^That depends on the listeners age and musical preference ... This being a rock forum I would think they are OK.
Sweet Child O Mine
Smells Like Teen Spirit
Dont Bring Me Down - ELO
Since You've Been Gone - Rainbow
Don't Believe A Word - Thin Lizzy
The above five riffs may be among your favourites but there's no way they belong on a list of the most recognizable. Most casual radio listeners would be doing well to name one, or at the most two, of those songs.
Maybe these for a more casual listener...
Little Red Rooster