Can someone tell me the name of the original one?

anime/movies OST

Attack on Titan OST - Armored Titan Music Theme

https://www.youtube.com/channel/UCtzb0BnBCI4GiQknu1IPHtA

Flea waltz / Flohwalzer - Unknown/Anonymous - Arrange by McDony L

My Freeze Ray from Dr. Horrible's Sing-a-Long Blog

sorry bout the last 3 minutes.... didn't know how to cut it.... SORRY!!!!

~Queen