Moving from desktop to laptop

I have just got a new Win 7 64 bit laptop, and have tested the free version and it works just fine. I copied all my music from the desktop to the laptop too.

Question is this, on the desktop, I had put all my songs into groups (rock, pop, soul, blues etc) to make for easy finding. Is there anything I can do to import or copy this grouping information to the laptop (has exactly the same music on it) to avoid having to re-categorise thousands of songs?