Winthrop Music Association is a 501(c)3 non profit organization formed in 2005 to ensure the continued success of the Annual Winthrop Rhythm & Blues Festival. WMA strives to promote arts and cultural activities in the Methow Valley and beyond. WMA is a supporter of Methow Valley Arts, Methow Valley Theater, Washington Blues Society, Inland Empire Blues Society, Cascade Blues Association, Oregon Food Bank/Waterfront Blues Festival, The Cove Foodbank, Room One, Tom Zbyszewski Memorial Scholarship, Methow Valley Schools Music Program, and others.

The current makeup of the Board is Rick Northcott, Bart Northcott, Rich Reeves, Jim Smith, Dave Swenson, Peter Dammann, Don Ashford and Erika Olsen (Festival Director).