The emulator is PearPC. However it is very slow and it won't run even iTunes properly. I had tried installing Panther on PearPC about an year back. Tiger would be a bit faster but Logic would be impossible to run on it.
Next option is.. erm.. ummm... Tiger on x86 hardware. But, unless your processor supports SSE3, you won't be able to run it. Even then, it'd be quite a pain running Logic on it.