(There's no video for Mac OS 9.2.2 for PowerMac G4 MDD yet. Please contribute to MR and add a video now!)
An OS X disk image named "OS9General.dmg" -- contained on the Software Restore CDs bundled with these systems. It includes "Applications (Mac OS 9)" and "System Folder". Unlike retail Mac OS 9 installers, this software is able to boot the PowerMac G4 MDD (FireWire 400 models) into OS 9 or can be used as Classic Mode on any PowerMac running Mac OS X v10.1-10.4. This System includes the "Mac OS ROM" file v9.6.1.
os9general.dmg (352.92 MiB / 370.06 MB)
Mac OS 9 / DMG image
1) Format your hard disk volume with Disk Utility in Mac OS X as "Mac OS Extended" and make sure to select the option to include Mac OS 9 Drivers.
2) Mount the .dmg file and copy the System and Applications folders from the disk image to the hard drive.
3) Restart your G4 via the Startup System Pref Pane or with the Option key held down, and select your Mac OS 9 drive as the Startup Disk.
Emulating this? It should run fine under: SheepShaver