Jeff "Skunk" Baxter recalled how he helped make Donna Summer’s “Hot Stuff” a hit using a $35 guitar. And the Steely Dan co-founder, who went on to work with the Doobie Brothers, said he nearly hadn’t bothered attending the session for Summer’s 1979 album Bad Girls. The single was Summer’s second of four No. 1 hits. It opened her music to new listeners with a more rock-oriented sound as she crossed over from disco music under the auspices of Italian producer Giorgio Moroder. “It almost didn’t happen,” Baxter told Vertex Effects in a recent interview (below). “My assistant forgot to...