It may be both, for the "entertainment" services offered, and for the "goods" (e.g., music albums, etc.) sold. You can generally specify more than one class with a single trademark/service mark filing.
This is not to be construed as legal advice, and I am not your attorney, A conflict check and engagement letter would necessarily be required before any retention or attorney/client privilege exists.
I agree with the responses given by my colleagues. However, I want to simplify the matter. The federal statue covering trademark actually uses the term "mark" and there is not distinction between a trademark and a service mark.
I agree that he probably will have a combination of goods and services protected.
There is no practical difference. While it is easier to refer to trademarks that identify services as service marks and those that ID goods as trademarks they are both in fact trademarks.
Your friend should contact a lawyer that can conduct the proper clearance on the name and make certain it is filed properly with the USPTO.
I will link you to some helpful TM info below and most of us here, including myself, offer a free phone consult.
The law firm of Natoli-Lapin, LLC (Home of Lantern Legal Services) offers our flat-rate legal services in the areas of business law and intellectual property to entrepreneurs, small-to-medium size businesses, independent inventors and artists across the nation and abroad. Feel free to call for a free phone consultation; your inquiries are always welcome:
DISCLAIMER: this is not intended to be specific legal advice and should not be relied upon as such. No attorney-client relationship is formed on the basis of this posting.
I disagree with my colleague. A trademark prior to registration is notated as TM to signify a "good." A service mark prior to registration is notated as SM to signify a "service." There are classification you can register under, some are for goods and others are for services. An artist could qualify and register marks under several types of classifications, both goods and services. Your music artist friend should consult with an entertainment attorney for sound advice on what works best for his career.