I know you're not being entirely serious but I think the singing was pretty well justified in original Macross & Robotech. You're got this race of brutal warrior clones who are still human at the fundamental level, and without the emotional comping that people normally learn they're left dumbstruck by the feelings that listening to music brings. I'd contrast it with something like Star Trek Beyond, where the only reason the transmission that blew up the enemy ships was retro music was to try and chase the success of Guardians of the Galaxy.
Anyway, I'll also throw in my props from Macross Plus, it was stupendous.