This is just Groucho's part.

Bb    F7     Bb B7  Eb E7
//// | //// | //// | //// |

Bb    Cm F7  Bb     C7 F7
//// | //// | //// | //// |

Bb Gm Cm F7  Bb Bb7 Eb Eb7
//// | //// | //// | //// |

Bb    Cm F7  Bb Eb  Bb
//// | //// | //// | //// |

D7    A7     D7     G7
//// | //// | //// | //// |

F     C      C7     F7
//// | //// | //// | //// |

Bb Gm Cm F7  Bb Bb7 Eb Eb7
//// | //// | //// | //// |

Bb    Cm F7
//// | //// |  *     *     *  |
             Quack Quack Quack