qr.wue.de is the Location Info page for the mobile Internet in wort. On this page you can find information about many places throughout the city, where at some point in the last 60 years something has happened with music - or even happened.
It's best to use this site if you're on the go. At most of the places you can find somewhere a little QR code. Scan it with your smartphone and you can find out: who, when played here. Not completely, but interesting! Have fun on your exploring!