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As a single member LLC your income taxes would be filed using Schedule C of Federal form 1040 just as they are now. Therefore there would be no tax advantages. The only advantage of any substance would be in the area of legal protection.
An S Corporation would have another advantage for you and is worth considering. It would permit you to have the S Corporation hold ownership to all copyrights thereby enabling you to transfer that to your heirs at some future time. At the same time you would acquire the legal protections of an LLC. The disadvantages to a PA S Corporation are formation costs which can be a bit high. They may not be as expensive as the LLC , however, since an LLC has publishing requirements.
In summary, an LLC offers you no tax advantages but does offer legal protections. An S Corporation offers the same legal protections as the LLC and has the added advantage of transferability of copyrights to future generations.