1) Air 2) Chansonette 3) Poem 4) Song 5) Tune 6) Witticism 1) Catchy tune 2) Cheerful little earful 3) Debut single 4) French word used in English 5) Happy tune 6) Jaunty tune 7) Jingle 8) Light air 9) Little jingle 10) Little tune 11) Mary Had a Little Lamb 12) Merry tune 13) Second word of Jack and Diane 14) Simple number 15) Simple tune 16) Trifling tune 
• (v. t.) A saying or utterance; especially, one that is short and frequently repeated; a theme. • (v. i.) To sing; to warble a little tune. • (v. t.) A song; a lay; a little poem intended to be sung.
Dit'ty intransitive verb To sing; to warble a little tune. « Beasts fain would sing; birds ditty to their notes.» Herbert. Dit'ty noun ; plural Ditties . [ Middle English dite , Old French ditié , from Latin dictatum , past participle neut. of dictare to say often, dictate, compose. See Dictate , transitive verb ] 1. A saying or utterance...
[n] - a short simple song (or the words of a poem intended to be sung)
ditty A short, simple, version of a popular song (or the words of a poem intended to be sung).
noun a short simple song (or the words of a poem intended to be sung)