Hey before I start writing here some recommended song for you:

FNAF Songs:

The Bonnie Song by GroundBreaking

Follow me by TryhardNinja

Just Gold (its one of my personal favorite X3)

Sonic:

City Escape (of course)

Pumpkin hill ( its the best Halloween song XD)

Unknown for me (Knuckles theme X3)

Mario:
Luigi balled (its super Funny! XD)

Yoshi song

Undertale:
Sans theme- Megalovania

Sans battle - Stronger than you

Pokémon!

Where is the love by Black eye peas (The message is the best)

Heathens by twenty-one pilots