OrozP two simple ways,
1 go to song mode select EDIT choose all songs you need to transfer , then select export, bottom right of screen, choose a destination , then send this .stsa file to your friend , he simply imports this file and will have all the songs plus any of their settings like lyrics , audio segments etc.
2 go to settings , create a full backup and send that to your friend this will make a full copy of your ST3 on his device , this is only good if that’s what you need otherwise use method 1