There is a little gap in functionality in the Spotify player:
deleting the currently playing track from the current playlist...
...so I created a small app that does just that.
Further down the road it seemed like a good idea to also add the "harvest"-functionality:
You select a (harvest) list where you want your good songs to be kept,
(in the options of harvest (next to the chest))...
...and if you go through one of your other lists to delete (other) songs from it,
and you encounter songs you treasure and want to have on this harvest list,
you can tap the 'harvest'-chest and it's automagically added to this list.
Thanks to all for the support on this app,
I'm glad I can help you guys/gals out...