Orchestra is a system for orchestrating project teams of experts and machines. Projects can include everything from design teams working on a client's project to newsrooms bringing together reporters, photographers, and editors for a story. In Orchestra workflows, you can assign senior experts to review other experts in order to provide feedback and iteratively refine the work. Orchestra also brings machines and automation onto projects: a crawler can collect content from the web before an expert combs through it, or a classifier can filter out bad data so an analyst spends less time in the noise. New workflows can be added with some simple python glue and an html interface.