This week’s case study -- the final episode of our first season -- began life as a soulful ballad entitled “One Step Ahead” by the one and only Aretha Franklin.  Released on the Columbia label in 1965, the record scarcely made a splash.  In 1999, more than 30 years after its initial release, the rapper known as Mos Def wrote a sexy and thoughtful little composition he called “Ms. Fat Booty” to some funky music that sampled a significant taste of Aretha’s “One Step Ahead.”  The dozens of new versions since then include one that links Mos Def’s rhymes to the music of Marvin Gaye (not Ms. Franklin) to cover versions of Aretha’s original recording by Lauryn Hill and Ledisi, to rocksteady, dub, and drum’n’bass remakes, and finally to a very recent hardcore rap version by Atlanta’s J.I.D. that’s inspired tens of thousands of TikTokers to make 20-second dance videos pegged to a single bootylicious line spit by J.I.D.