Adding a schedule to a Program is Step 3 of the process described in How the UMix System Works.
The Program gives you the ability to layer music schedules that change automatically as the year passes.
Christmas music is a common example. Assume you have already created a music schedule with start and end dates of 12/1 to 12/31. Press the + icon and select that schedule from the drop-down. Use the Up/Down arrows in the Action column to give it a higher priority than your Weekly Recurring Schedule. On 12/1, your Christmas schedule will automatically begin to play.
Add Music Schedule to a Program