I started a new thread, since this really doesn't have anything to do with
gNewSense.
There is a log-in sound that was enabled on Trisquel 5.5 (Brigantia) that is
truly spectacular. It is disabled by default in 7.0 (Belenos), but is
relatively easy to enable.
Many thanks to Dave Hunt for explaining that all we have to do is go to
system settings>startup applications and click on the "add" button. The
command that worked for me and my System76 Wildebeest was:
/usr/bin/canberra-gtk-play --id="desktop-login" --description="play login
sound" --volume=10
and if it doesn't work for you and you're wondering if it's really worth the
trouble to look around for a different command that does, the sound is:
usr/share/sounds/ubuntu/stereo/destop-login.ogg
It really is that beautiful.