You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: The direction of the band is dominated by lead guitarist, lead vocalist, keyboardist, bassist and principal songwriter Billy Corgan. Journalist Greg Kot wrote, "The music [of the Smashing Pumpkins] would not be what it is without his ambition and vision, and his famously fractured relationships with his family, friends, and bandmembers." Melissa Auf der Maur commented upon news of the group's reunion, "Everyone knows Billy doesn't need too many people to make a Pumpkins record, other than Jimmy [Chamberlin]—who he has on board." In a 2015 interview Corgan himself referred to the current iteration of the band "as sort of an open source collective"  noting that "It's whoever feels right at the time." Many of Corgan's lyrics for the Pumpkins are cathartic expressions of emotion, full of personal musings and strong indictments of himself and those close to him. Music critics were not often fans of Corgan's angst-filled lyrics. Jim DeRogatis wrote in a 1993 Chicago Sun-Times article that Corgan's lyrics "too often sound like sophomoric poetry", although he viewed the lyrics of later albums Adore and Machina as an improvement. The band's songs have been described as "anguished, bruised reports from Billy Corgan's nightmare-land" by journalist William Shaw.Smashing Pumpkins, unlike many alternative rock bands at the time, disavowed the influence of punk rock on their sound. Overall, they have a diverse, densely layered, and guitar-heavy sound, containing elements of gothic rock, heavy metal, dream pop, psychedelic rock, progressive rock, shoegazing, and electronica in later recordings.
Output:
What is the last of the person without whose famously fractured relationships, vision, and ambition, Smashing Pumpkins would not be what it is, according to Greg Kot?