Update2: Rumor has it musical isntruments may not be exempt after all.
Udpate: Via synthetic in the comments:
"He tells me that this article says musical instruments and photo development machines are not affected by the law. The reason is that equipment might become damaged during PSE testing, or the owner may claim that it became damaged during testing The government doesn't want to be held liable for paying the replacement cost on these expensive items."
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Anyone know Japanese? Title link takes you to an article in Japanese on the Electrical Appliance and Material Safety Law that goes into affect on April 1. Someone on AH pulled the following translation from the article which sounds like electronic musical instruments and photograph baking machines will be exempt. : )
"The economic industrial ministry on the 14th, decided that the used electronic musical instrument and the photograph baking machine etc are designated as outside the object of electric supplies safe method. Including the used item, it shows safety, sale of the electric product which does not have the “PSE mark” is prohibited from April 1st. Assuming, that as for the electronic musical instrument and the photograph baking machine etc during electric leakage inspecting there is danger where the equipment breaks down, it makes outside the object, also after of the April continues and can transact in the old market."