Nur Ein is an annual "sidefight" challenge conducted at songfight.org which pits artist against artist in a multi-round battle of songs written and recorded to the rules provided for each round. The first qualifying round was completed April 19th and 20+ recording artists are now entered into the fray.
For those of you new to the ways of songfight, I might warn you that the longrunning website is unlike probably every other musician community. Opinions fly freely and rather than the standard, clammy backslapping found on most, be prepared for a large share of negative, but possibly constructive talk. You'll find all this on the forum boards which is where the real artistic exchange of the songfight experience takes place. There you will find a whole host of regulars who can be a bit daunting for artists shy to this kind of thing; but get over it. Bottom line is songfighting improves your songwriting, and recording.