Whenever I work on a serious music project where the client wants the best possible results at every stage of the creative process, I recommend Bill Wolf at Wolf Productions for mastering. Bill's ears, attention to detail, and amazing audio knowledge is second to none, and he has developed these skills over decades of experience. I always strive to attend my client's mastering sessions with Bill because I know I will learn a few things from him. Bill has a great sensitivity for the artist's ideas about their project, and always has great ideas and suggestions to make the final product the best it can be. He approaches mastering with the attitude of "What would best serve the music" and not the current trend of "How can I make it the loudest?" (although if LOUD is the most important thing to you, then he can make it as LOUD as it can be.) Bill is my #1 pick for mastering any music project.