The Raphnet Wii Classic Controller to USB is the real del. It's seriously as good as a Wired Xbox 360 guitar. Legitimately buy one of these if you have a Wii Guitar.
Amazon.com: Wireless Guitar for Wii Guitar Hero, Band Hero and Warriors of Rock : Video Games
Amazon.com: Wireless Guitar for Wii Guitar Hero and Rock Band Games, Guitar Hero Wii Guitar Compatible with All Guitar Hero Games and Rock Bands 2 and 3 Exclude Rock Band 1 (White) :
Buddies Wireless Guitar For Wii Guitar Hero And Rock Band Games Color Black Video_Game_Accessories - Walmart.com
Les Paul Guitar (Guitar Hero III) - Wii Stuff
Amazon.com: Wireless Guitar for Wii Guitar Hero and Rock Band Games, Guitar Hero Wii Guitar Compatible with All Guitar Hero Games and Rock Bands 2 and 3 Exclude Rock Band 1 (White) :
Best Buy: Activision Guitar Hero World Tour Wireless Guitar Controller for Nintendo Wii 95559|95559
Buddies Wireless Guitar for Wii Guitar Hero and Rock Band Games (Excluding Rock Band 1), Color White - Walmart.com
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Keytar Hero (Using a Wii Guitar Controller As a Synthesizer) : 7 Steps (with Pictures) - Instructables