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#202858
Just wanted to surface this link to the old forum in case anyone is having the same problems that I was.

Getting the Tsunami Arduino library example running on a Due, and kept getting "'Serial1' was not declared in this scope"

To solve this I looked in Tsunami.h and replaced the following line:
#include <HardwareSerial.h>
With this line:
#include <Arduino.h>

Worked for me too. All up and running and making sounds now!

https://forum.sparkfun.com/viewtopic.php?f=14&t=48971