The lyrics center on a final dance ("Tanz heut Nacht nochmal mit mir"). The "last chord" represents the inevitable end of a shared song—a life together—that is about to fall silent.
You can listen to "Der letzte Akkord (Version 2022)" on these platforms: Der letzte Akkord (Version 2022)
While the 1998 original was a staple of late-90s Schlager, the 2022 version benefits from: The lyrics center on a final dance ("Tanz