Do You Need a Wii Fit Board for Music? No.

The Wii Balance Board is for fitness games (Wii Fit, Wii Fit Plus, EA Sports Active). It has zero audio function.

To play music on Wii:

• Photo Channel — SD card with MP3/AAC → slideshow + background music.
• Internet Channel (Opera) — YouTube, Pandora (legacy, slow).
• Homebrew — WiiMC, USB Loader GX play media from USB/SD.
• External: Phone/PC/Bluetooth speaker.

Balance Board = yoga, not Yanni.