SESAC

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Society of European Stage Authors & Composers. From http://www.sesac.com/About/About.aspx :

Performing rights organizations (there are three of us in the U.S.[SUP]1[/SUP]) are businesses designed to represent songwriters and publishers and their right to be compensated for having their music performed in public.

[SUP]1[/SUP]The other two are ASCAP and BMI.