Systems and methods are provided to integrate disparate media services and applications across an organization. The media services are connected to an interoperable media services bus by creating a connector API for each service, thereby enabling the media services to exchange messages related to transactions to be performed involving media assets and/or metadata associated with media assets. To support complex transactions involving coordinated activity by multiple media services, an orchestration service advantageously performs a coordinated sequence of request/response transactions, referred to as a “workflow.” The workflow may include requests conditional on responses to previous requests, multiple parallel requests, a combination of synchronous and asynchronous requests, and so on. Multiple workflows may be managed concurrently.