Open iTunes on your laptop, and click on "Home Sharing" in the left pane.
Log into your iTunes account and click "Create Home Share."
Open iTunes on all of the other networked computers in your home, and log into the same iTunes account.
Go back to your laptop, and look for the networked computers' iTunes libraries in the left pane of iTunes.
Click on "Settings" and select your desired categories, or drag and drop selected songs into your own library on the laptop. Select "Items not in library" to move songs from the chosen iTunes library to your laptop's iTunes library.