|From the episode:||The Peanut Butter Kid|
"Who Will Buy?" is a song from the musical Oliver! and the later film adaption.
When Stewie fails an audition for a commercial in "The Peanut Butter Kid", Peter and Lois concoct a home made energy drink laced with cocaine in order to boost Stewie's performance. When he is given the drink, he becomes hyper and breaks into "Who Will Buy?".
Who will buy this wonderful morning?
Such a sky you never did see!