Anything but Enterprise
"Welcome Everyone! This Channel is dedicated to my friend, whose dislike for this main theme song is so great, that he once said to me 'You could put in ANY theme song in here and it would still be better than 'Enterprise'. So here you go, friend! Enjoy these themes from other shows over this beautifully designed main title of Star Trek: Enterprise. (Seriously, it's my favorite opening visually). If there's a particular theme you'd like to hear, let me know. I'd love to see how it works

Hildegard von Blingin' -- Medieval Style With Modern Music
"Medieval $hitposting, also fondly known as Bardcore, for the discerning clergyman, noble, or muck-gathering peasant."
There are currently only four music videos. Hopefully, it will have many more in the future.
LUMOS Orchestra: Lviv Unique & Magical Orchestra-Soundtracks
Peter Hollens' music videos using only his voice and mouth.
8-Bit Big Band's YouTube Orchestra Video Game Music Channel
This small YouTube channel made popular/famous video game music into jazz and pop from an orchestra -- "The 8-Bit Big Band is a full sized Jazz/pops orchestra that formed to celebrate and realize some of the best musical themes written from various video games from all consoles! The orchestra ranges from 25 members all the way to 65 members depending on the music, and draws from some of most sought after musicians from New York City, and around the world..."
There's also some humor too. It also reminded this old school ant of Video Games Live's concerts.
THENvsNOW™
"THENvsNOWâ„¢ - Your favorite actors from popular movies 80-90's - Then and Now. Best celebrity videos: tribute, before and after..."
"Ghostbusters" Come Together On Kimmel|News | Dark Horizons
Whitney Avalon's Princess Rap Music Videos
Not good as Epic Rap Battles IMO.