Sara Bareilles and the ‘Girls5eva’ gang hit the high notes while acing some trivia on this episode of PEOPLE Pop Quiz. The real-life singer-songwriter and Renée Elise Goldsberry, Busy Philipps, and Paula Pell reveal who the girl group’s dream collab would be, which of them cares the least about feet, and how it’s possible to have forgotten about working with Elmo on an old gig.