Tax laws require that a business must show a profit in in 3 out of 5 years (if my memory serves) - if not they consider the activity a hobby (not subject to write offs).
There are certain ways around the law if you can show that the artistic works are "a continuous process" - as an example, a song has been published, with the potential to generate revenue.
It all depends on how aggressive you want to get as a tax payer (ie: how much income you want to hide or write-offs you want to take).
If you want to establish a business you should consider being a sole proprietor rather than a corporation. A corporation requires filling fees, a board, monthly meetings (with minutes) etc. etc. - which is a pain in the ass!!!
A couple of warnings - if you claim a business you must (in the event of an audit) prove intent of business (even with no revenue/profits) meaning a business plan, marketing activity, a seperate checking account (in the business name, etc, etc.)
Also, if you try to claim a part of your house for business use (a bedroom) you then have to realize a business profit in the event of a sale of the house - as an example - you sell the house for a $100,000 profit and the bedroom is 10% of the house - the business has a $10,000 profit to claim - subject to the higher tax rate.
Also keep in mind - a tax form C (Business activity) is a red flag for an audit - as is buness use of the home, etc.
If you buy thousands of dollars of gear - maybe it makes sense, but think very carefully - and talk to a tax accountant first.