From how MIDI works, to how to connect devices through it, to how it integrates into a computer environment, "MIDI Power!" by Robert Guerin is a comprehensive reference guide to MIDI. You will get an in-depth look at MIDI, its messages and protocols and acquire the information you need to navigate it with comfort and ease. Whether you’re a beginner who just wants to make sense of MIDI or a veteran wanting to realize its full potential, "MIDI Power!" will help you produce professional music now and in the future.
You might consider the following great values instead:
USB to MIDI keyboard Interface Converter In/Out Cable. Simply connect the USB cable at one end to your computer, and the MIDI cables at the other end to your MIDI keyboard or other MIDI device. The USB MIDI Interface 1x1 is class compliant, which means you just connect the USB cable and it works - no drivers to download, configure or install!
The MidiFace Thru is USB powered and supports MIDI In, MIDI Out and MIDI Thru. It is Class Compliant, which means you won't need to install drivers on your Mac, Windows XP or Windows Vista computer. Just plug it in using the included USB cable and you are ready to go! It even includes two MIDI cable so you can connect your keyboard or other MIDI device to the MidiFace.