If you could go back in time and stop any one person or group's musical career, who or what would it be?
This isn't a "go back in time and assassinate" someone question. It's just their musical career never takes off and thus any music they ever would have made is no longer in this timeline.
I worked retail for exactly one Christmas. The day I worked the toy department they had one album on repeat for eight hours. I hated Christmas music for years, and now it just annoys me.