So far as I'm aware, musicians (especially bands) are looking for all-in-one solutions like Zoom Q4n, Q8 and Sony HDR-MV1 for casual footages of their live performances on YouTube. Otherwise, they would need dedicated recording system with multiple microphones, DI's, mixers, etc. along with multiple video cameras for serious promotion videos.
Q4n, Q8 or HDR-MV1 are handy and practical, but the combination of the sound and video quality of Sony and handling of Zoom would be more ideal. Both Sony and Zoom automatically creates new files when they hit the 4GB file size limit. Zoom creates new files with seamless transitions, whereas there are a couple of second of gap between files on Sony. A single battery lasts much longer on Zooms.