this my first tutor.i teach you how to create a ending song after mission is ending.follow my hints:
1.Select a ending song if you like(ex.I use song eminem song :))
2.You must put a ending song in reguitments:
-the last objective is cutscene
-be good ending,add a actor with animation
3.select duration time same a song duration.(ex.4:30)
4.enjoy it
thanks for read me tutor