Samba de Amigo - Platform: Dreamcast

All music mode:
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Select arcade mode, then quickly shake Left Maraca 
High fifteen times at the height selection screen 
to unlock all songs. Note: For the standard Dreamcast 
controller, hold the Left Maraca High button (Up). 

Random mode:
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Quickly shake Left Maraca Low fifteen times at the 
difficulty selection screen. Note: For the standard 
Dreamcast controller, hold the Left Maraca Low button (Down). 

Super hard mode:
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Quickly shake Left Maraca High fifteen times at the 
difficulty selection screen. Note: For the standard 
Dreamcast controller, hold the Left Maraca High button (Up).