What you have here is a potentially complex tracking problem. You need to track the band so that you can make your lights follow. Not seeing your footage, my assumption would be that there is 3D motion going on with your subject, ie. turning, which makes matters even more complex.
If you want to try tracking inside FCP take a look at Mocha. This whole procedure though is a bit advanced.
But, there’s also the painstaking method of manually moving your lights, and if they are blinking in some way, that would give you little windows of “cheat” time. So it would be relatively easy.
Have a wonderful day.