MaxMSP -> Arduino -> 300 addressable RGB LEDs

Hello,

I would like to control the individual brightness and color of 300 LEDs with MaxMSP. Setting up the Max patch to send an address # and RGB values is easy, but sending that through the Arduino to the LEDs is where I'm stuck. What arduino code would allow me to do this?

These LEDs will be arranged in a spiral pattern on a sousaphone bell.

All the best,

John