What you're looking for is called a symbolic link or symlink. It basically creates a shortcut to a folder in another location. Creating the symlink creates a new folder, so you can either use it to link to new subfolders inside the video and music folders in your home or delete the existing video and music folders in your home and use the symlink to recreate them.

This won't delete the shortcut to Video or Music from your Files browser.

So if your videos are stored in a drive mounted at /mnt/datadrive/videos/ and you want to create a symlink folder called video2 in your home directory you'd run this from your home directory:

ln -s /mnt/datadrive/videos video2

Note there's no slash at the end of the path for the source folder. I forget why, but you have to leave it off.