"Rudy Wants to Buy Yez a Drink" is one of a handful of more straightforward rock songs Frank Zappa wrote while Flo & Eddie (Howard Kaylan and Mark Volman) were in his band that never got much exposure (others include "Would You Go All the Way?" and "Eddie Are You Kidding?"). Also, this song is a rare case: it fits in the "life on the road" concept which guided most of Zappa's writing from 1969 to 1971, but deals with something else than sex, drugs, or hotels. Rudy is a Musicians' Union representative. He's here to check if everybody paid his union dues. Zappa depicts him as a slightly deranged person. He carries a gun: "I hope the bulge/Won't bum you out/Wanna get a good look?/Let me pull it right out/Let me whip it right out." Of course, the "bulge" is also interpretable as something else that could be in his pants. The song itself is a rock showcase for the vocal talents of Flo & Eddie. It also features nice trombone work by George Duke. There are a few changes in rhythm and style (things get a little tropical for a moment) to fit the humorous plot. An entertaining song, "Rudy Wants to Buy Yez a Drink" was nonetheless quickly forgotten and very rarely played live (it has been spotted only a couple of times in 1971 and briefly resurfaced in 1976 -- no official live recording).