A computer system displays a first user interface that includes respective selectable representations of a plurality of categories for media items associated with the computer system, including at least a first selectable representation of a first category and a second representation of a second category. While displaying the first user interface for configuring the system user interface, the computer system detects a first input selecting a set of one or more of the plurality of categories. After the set of one or more of the plurality of categories were selected by the first input, the computer system displays the system user interface, wherein displaying the system user interface includes, over time displaying the system user interface with a plurality of versions of the first background that respectively include media items selected from media items in respective categories in the set of one or more of the plurality of categories.