Abstract : The software framework we present implements a simple and generic representation of the temporal dimension of musical structures used in computer-aided composition software. These structures are modeled as ordered sets of abstract " timed items " whose actual dates can be set and determined following different strategies. The timed items can be linked to an underlying action scheduling and rendering system, and can also be used as temporal handles to perform time stretching and hierarchical synchronization operations. A graphical user interface associated with this model can be embedded as a component within musical editors. We give several examples of musical objects implemented in this framework, as well as examples of time-domain operations and user interactions.