raphnet Classic Controller to USB Adapter Wii Guitar Drum Turntable NES SNES V3 | eBay
Amazon.com: ELECOM Wii USB Adapter, Game Classic Controller / Classic Controller Pro to USB, Adapter for Windows PC for only one Player, 1m / 39 inch Length (JC-W01UWH)
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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.
Raphnet Dreamcast Controller to USB Adapter v2 - Etsy