The 15-track album combines the original audio recordings of the band’s songs melded with new performances from the Royal Philharmonic Orchestra (RPO) of London. Def Leppard revealed an orchestral version of their 1987 hit “Hysteria,” the second single on their upcoming Drastic Symphonies album, a collection of the band’s songs over the past 40 years reworked as symphonies, due out May 19.