The production of “separate collections” (bieji 別集) or collected works in China is a social practice that emerged between the 1st and 3rd centuries CE. This research focuses on how the practice developed over the course of the Song dynasty (960-1279) in terms of literary materials involved, competences required, associated meanings, and its links to other social practices. I examine extant collected works, descriptions of them, and contemporary feedback on their production to create a series of snapshots that reveal its trajectory over time. Surveying the emergence of the practice in the early imperial period through its development in medieval times shows that pre-Song dynasty production of collected works was the result of several pre-existing conditions: competences related to bookmaking, the emergence of the idea of the inscription of authorial personality in literary works, the elevated status of belles-lettres, and several pre-existing tropes that lent it increasing importance. As the practice began recruiting scholars in 1020, it underwent a series of changes: attention to loss and variation between editions gave way to the search for missing works and the production of increasingly complete and authentic editions. This was followed in 1080 by several innovations, including the organization of works literary according to chronological order, rhyme, or topical category and insertion of annotations and a chronological biography. After 1180, compilers began synthesizing the accomplishments of previous editions to make editions that featured multiple annotators arranged in increasingly sophisticated ways for a new readership that were strongly associated with commercial printing. I identify six varieties of the production of the collected works of Song authors, each with distinct aims and associations that differed with respect to elements of practice, the practitioners they recruited, and how they linked with other social practices toward larger social goals. Findings contribute to Chinese book history by contextualizing change in formalistic trends over time. Identified as a social practice, the account of change and variation in the compilation of collected works during the Song presented in this research adds unique perspective to the subject of social change in this pivotal period of Chinese history.