Carl Gradener is not a widely recognized name in mainstream music history, and there may be limited information available about him. It is possible that he is an emerging artist or a local musician whose work has not yet gained significant attention on a larger scale. If you meant a different artist or if Carl Gradener is associated with a specific niche or genre, please provide more context or check the spelling. Many musicians may exist within specific communities or genres that have not been covered extensively in popular music databases. If you're looking for information on a similar-sounding artist or a specific genre they may represent, please let me know, and I would be happy to assist!