PCsx2 is the best emulator although it is still in beta stage and it is also free. see related link
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No, a DS emulator is not compatible with the PS2
A complete list of all PS2 emulators, including download links and description is available at www.emuwiki.com
With a emulator for the PS1
The PCSX2 emulator can only bring up the menus or intro on the different Rock Band PS2 games according to there files with a newer version of the emulator than is available for download at the related link
The best emulator is NO$GBA