Simply put if you have not heard about alternate tunings for guitars. This means that the guitar will play the D chord without you touching the fretboard. So this will give you more freedom as a guitar player. But it will also limit you're playing in some way. And I'm not going to get into all that here right now. However this song Secret Story is very nice and have a very good feel to it.
The song Secret Story is found on Ulli Boegershausen's album Private Stories from 2002 and it is actually the first track on his album. It's a beautiful song composed by Ulli and I think it's a good choice to have as the first song on the album. The song might be slow, but Ulli have put in some fast little guitar licks here and there so anyone that are interested in learning this song will need to put in some work to get it right.