Hanson are a bubblegum pop band from Tulsa, America. Their most famous song is inaruguably, "MMMBop". They appear in http://familyguy.wikicities.com/wiki/Chitty_Chitty_Death_Bang asking the Griffins if they can use the phone. Peter then shoots at them, thinking they are the Children of the Corn.
In a later episode, Quagmire says he would have Taylor Hanson, the lead singer, if he could have any girl in the world, not realising that Taylor is a he.