As of October 2023, there is no widely recognized artist by the name of Nicolas Sejan in the music industry. It is possible that he is an emerging artist or operates within niche genres that have not gained significant mainstream attention. If he is a local or independent musician, details about his genre, notable works, and impact may not be readily available in established music databases or historical records. If you have specific information about his work or context, I can help provide a more tailored overview based on that information. Alternatively, if you meant a different artist or need information on a specific genre or style, please clarify!