When you have to shoot a concert with energetic musicians, you will come across with complex lighting situations. In most of the cases, the musicians will appear too bright compared to the background; this brightness will be too much. Your aperture priority will not be able to handle this brightness.
To get the best possible output, in this case, you will have to go for an underexposure. You should consider at least a stop’s underexposure to get more details of the performer. Rest of the details in the shadows can be highlighted during the post production process.
As long as you get the subject exposed perfectly, you don’t need to worry even if you don’t do it in HDR mode.