So, I've seen a lot of Five Nights at Freddy's fanimations where the characters perform on stage and sing a song.
Some of my favorites - Fredbear singing Sixteen Candles by the Crests, the main trio singing Shout by the Isler Brothers, Foxy singing Don't worry be happy by Bobby McFaron, Funtime Freddy singing Beat it by Michael Jackson, and the Toy animatronics singing Never gonna give you up by Rick Astley.
Channels where I found these videos, Jose Cervantes and Junior 0437.
Since I can't animate, I had to resort to this to show fan-made Fazbear performances of mine.
My Wayward Son - The Carpenters
Freddy, Bonnie, and Chica:
Carry on, my wayward son
There'll be peace when you are done
Lay your weary head to rest
Don't you cry no more
[Bonnie does a guitar solo]
Chica:
Ah
Once I rose above the noise and confusion
Just to get a glimpse beyond this illusion
I was soaring ever higher
But I flew too high
Though my eyes could see, I still was a blind hen
Though my mind could think, I still was a mad hen
I hear the voices when I'm dreaming
I can hear them say
All:
Carry on, my wayward son
There'll be peace when you are done
Lay your weary head to rest
Don't you cry no more
Freddy:
NO
[Bonnie does another guitar solo]
Chica:
Carry on, you will always remember
Carry on, nothing equals the splendor
Now your life's no longer empty
Surely heaven waits for you
All:
Carry on, my wayward son
There'll be peace when you are done
Lay your weary head to rest
Don't you cry
Chica:
don't you cry no more
[Bonnie does another guitar solo]
Chica:
No more