Variety Staff Follow Us on TwitterThe Guild of Music Supervisors has unveiled its summer panel series lineup featuring many of the top musical tastemakers and composers working across television and streaming platforms today.The first panel kicks off with music supervisors from HBO’s lineup: Kier Lehman from “Insecure,” Jen Malone from “Euphoria,” Liza Richardson from “Watchmen” and Blake Leyh from “The Plot Against America.” Guild founding member Jonathan McHugh will moderate the panel on June