Nearly every distributed audio system in a commercial environment requires a background music source. Leaving this source device for the end-user to provide introduces many comprises and undermines the system performance and operation. Bluesound Professional streamers are designed specifically for commercial applications, with the features and performance that professional integrators expect from their audio systems. These include rugged, rack-mountable hardware, balanced mini-phoenix audio connectors, remote trigger/interrupt input, Hi-Res 192k/24-bit DACS, control system integration, and up to 64 perfectly synchronised zones in a BluOS system. Stream commercial and consumer streaming services, internet radio, custom URLs, USB drives, network drives, and external analogue and digital audio sources. Graeme Harrison of Bluesound Professional explains the pitfalls of user-provided music sources.