“Eternal Flame,” “So Emotional,” “Like a Virgin,” “True Colors” – the songs of Billy Steinberg not only nearly defined the sound of eighties pop, but have endured to the present day. Yet before Steinberg joined with Tom Kelly to pen those songs and so many others, he was fronting a power pop/new wave quartet with the unlikely name of Billy Thermal – Billy for Steinberg, Thermal for the city in which his father’s vineyards were located. The group, consisting of Steinberg, guitarist Craig Hull,