Thanks for all your very kind support. That is highly appreciated.

I did some investigation and I was able to track the composer of the song that was 'detected' in my music. This turned out to be a nice and friendly person, who was also amazed and surprised by the 'auto detection' in Youtube. He agreed also that his song and mine have seriously nothing in common, so he is curious how this will 'end' as well.

He was willing to write a message to the Copyright company for me. So I keep my fingers crossed.

It's really odd.

I must say I am extremely happy with Band in a Box. It is so 'easy' to create good backing-tracks for my stuff. It helps me focus on other stuff. Tonight I created a new video with the same song, but a different style and this time I played the 'lead' with a real instrument (a recorder). And it sounds AMAZING. I hope this time it will not be detected as copyrighted material. https://youtu.be/XMxXD5i5OBA

Thanks again for all your help and kind replies. This feels like a nice forum.