Is access from Amarok to mp3-files on NTFS partition possible ?

You do not have to copy your files onto the linux partition. In Linux, when you mount a drive, it doesn't show up as a a: , c:, j: etc. It actually shows up in your main directory structure.

For example, if I mounted my windows partition using

sudo mkdir /media/fat_partition
 sudo mount -t vfat -o defaults,user,exec,uid=1000,gid=100,umask=000 /dev/sdb1 /media/fat_partition

(I lifted this from Ubuntu's Mounting Windows's partition tutorial https://help.ubuntu.com/community/MountingWindowsPartitions .)

The top level of my file directory will have a long list of folders including bin, root, dev... etc. In that list, there is a folder labeled media. If I click on the media folder, I will see a folder labeled "fat_partition". This is the Windows drive I mounted earlier. You can get to this folder either by clicking on the drive mount icon in your file manager or navigating directly to it using the directory structure.

To access this in Amarok:
1) Click Settings and select Configure Amarok.
2) Click Collection in the left side bar.
3) You should see a long directory list. Inside this list, navigate to your partition. (Most linux distributions either mount drives to the media folder or the mnt folder. I believe Ubuntu defaults to media, but I may have changed my defaults.) Expand the folder out and locate your nfts drive. It will look like a large collection of folders. Expand its folders until you find your music folder(s) and put a check mark next to it. Then, click Apply. Then, okay.

You use this same method to find files on external devices. The only differences is that those should auto mount.

Goodluck! (Make sure you back up your files (movies, documents, music, and internet bookmarks) regularly while you're learning and burn a bootable image of your Windows installation. That way if anything goes wrong, you can recover. Macrium Reflect Free is an easy way to do this without a lot of expense or command line prompts.)