public String getSound() {
        return this.sound;
    }
<p>
The sound to play when the recipient receives the push notification. You can use the default stream or specify
the file name of a sound resource that's bundled in your app. On an Android platform, the sound file must reside
in /res/raw/.
</p>

@return The sound to play when the recipient receives the push notification. You can use the default stream or
        specify the file name of a sound resource that's bundled in your app. On an Android platform, the sound
        file must reside in /res/raw/.
aws-java-sdk-pinpoint/src/main/java/com/amazonaws/services/pinpoint/model/GCMMessage.java