Abstract: The bandwidth of a group of Internet users, called listeners, is pooled, and that bandwidth is employed to broadcast a data stream, substantially concurrently, to those listeners. A broadcast manager coordinates the connections between the originator of the data stream and the listeners. The originator divides the data stream into a number of channels. Each channel is transmitted over a tree of interconnected listeners. A given listener in a given tree receives that channel from its parent in that tree, and retransmits the channel as it is received to its children in that tree. Each listener is present once in each tree, so the listener receives each channel once. Listeners combine the incoming channels to reproduce the originator's data stream. The result is that almost the entire transmission bandwidth required for the broadcast is provided by the listeners. In some embodiments, a given listener is required to transmit no more data than it receives.