The star-studded pilot, which is now available via Louis C.K.'s website, features the comic and Buscemi as troubled bar owners Horace and Pete, Jessica Lange and Edie Falco.
Simon jumped at the chance to create original music for his friends' project, which is set in a poorly-lit, miserable hang-out.
Former M.A.S.H. star Alan Alda plays the place's unruly, racist bartender.