Tonight marks the landing of a massive summer tour ring-led by a British biggie of hard rock n’ heavy metal, Def Leppard, purveyors of such Billboard charters and classic rock radio staples as “Hysteria,”“Rock of Ages,”“Photograph,”“Pour Some Sugar on Me” and “Love Bites.” Styx soaks the lineup in prog and soft rock sounds –“Come Sail Away,”“Babe,”“Lady” and the like, while Tesla came up with the urgent power balladry of “Love Song” and a cover of that Five Man Electrical Band track, “Signs.”7 p.m., MidFlorida Credit Union Amphitheatre, Tampa, $25-$125.