Hello I am a musician-
I have played this for my start - end sound.
Hope you will enjoy it.
1.Download the file on your desktop
2.Right click the file and select extract here
3.open a terminal and run this command:
sudo cp -r $HOME/Desktop/dream /usr/share/sounds
open audio settings and select dream
LET ME KNOW PLEASE
Thanks to plmegalo for his great cover! [link]