CDs are back in rotation! If you grew up in the ’80s or ’90s, digital discs were pretty common, but younger millennials and most Gen Zers may not be as familiar with CDs and especially CD players.

BTS is going old school. On Tuesday, the seven-member K-pop group revealed that the third disc of their three-disc anthology album, “Proof,” will only be available in CD form. The "Dynamite" singers ...