_Air IX_: "Tune: 'Finale 1st act _Poor Vulcan!_'" seems to be the song "Pike; 'Pooltroon! Damnation! Zounds, unhand me;/ Either you villain, eat that word,'" (_Poor Vulcan!_ I, p. 23). _Air X_: "Medley. Tune, 'Black Joke'" is Leveridge's song of 1730. See E. V. Roberts, ed. Henry Fielding, _The Grub-Street Opera_ (p. 105) and Charles Wood's _The Author's Farce_ (Lincoln: University of Nebraska Press, 1966), p. 116. _Air XI_: "Welcome, Brother Debtor" appears in many eighteenth-century song collections, including Henry Roberts' _Calliope; or, English Harmony, a collection of ... English and Scots tunes_ (London, 1739-1749), p. 315. _Airs XII_, _XIII_ _and XIV_ are not traceable. ("Medley tunes 'Stoney Batter,' 'Tyburn Tree,' and 'Ballance a Straw.'") _Air XV_: "Bailiff's Song" has no tune and is not traceable. _Air XVI_: "Mind the Golden Rule" is not identifiable. _Air XVII_: "Tune 'Mary's Lamentation'" is the old ballad (set to the music of "Crimson Velvet"), the "lamentable complaint" of Queen Mary for the "unkind departure" of King Philip, "in whose absence she fell sick, and died," which begins "Mary doth complain;/Ladies be you moved," and appears in Richard Johnson's _Crown Garland of Roses_ (1659), ed. Chappell, 1895. Though popular in the seventeenth century, it may have been written soon after Queen Mary's death in 1558 (Simpson, p. 141). Verses similar to Air XVII ("I Sigh and lament me in vain,/These Walls can but echo my moan,") appeared in Signior Giordani's "Queen Mary's Lamentation," printed in Domenico Corri's _Select Collection_ of 1779 (III, No. 71). _Air XVIII_: The "Clown's Song" seems to have been specially composed for this work. _Air XIX_: "Tune: 'Let us take the Road'" is the famous "March in Rinaldo" by Handel. See Air XX, _The Beggar's Opera_ (Act II, ed. Roberts, pp. 130-131). _Air XX_: "Ballad Tune: 'The Race Horse'" with the title "The Rake's Progress." Thomas D'Urfey's tune is called "The Race Horse," and begins "To Horse, brave Boys of Newmarket, to Horse," and is "set to an excellent Scotch tune" called "Cock up thy Beaver" (Simpson, p. 112). It was first published with the music in D'Urfey's _Choice New Songs_ (1684) and appears as an untitled air in Kane O'Hara's comic opera _Midas_ (1764; ARS 167). It is also called "Newmarket," or "Newmarket Horse Race," Air XXII of the 1730 and 1750 versions of Fielding's _The Author's Farce_. The music is printed in Woods's edition of _The Author's Farce_, p. 133. California State University Northridge NOTES TO THE INTRODUCTION