On this day in music history, Def Leppard released one of the classic '80s track that would help shape the hair metal era. Exactly 38 years ago, the English rock band released on of the biggest ...

Plus, remembering feats by Janet Jackson, Mariah Carey & Christina Aguilera. By Gary Trust Your weekly recap celebrating significant milestones from more than seven decades of Billboard chart history.

It was a shakeup week on the charts, with new No. 1s on many lists and lots of big moves among the Top 40 singles. The most startling change came on the album charts, where Def Leppard`s ”Hysteria” ...