For FX’s “American Crime Story: The Assassination of Gianni Versace,” composer Mac Quayle credits producer Ryan Murphy’s love of electronic music for informing the score, but says, ultimately, they were writing a soundtrack to a “creepy serial killer.”

Flourishes abound in the “Versace” music, with nods to the fashion icon’s Italian heritage and that of his sister, or what Quayle, who scored last season’s initial offering in Murphy’s “American Crime Story” series, “The People v. O.J. Simpson,” describes as “classical flavor along with … a tense, creepy, atmospheric bed.” Unlike “O.J.,” which “needed to be very understated, subtle and minimal,” “Versace” demanded something a little bigger and more dramatic, he says.

Emmys: ‘Howards End,’ ‘The Sinner,’ ‘Patrick Melrose’ Bring Unique Sounds to Small Screen