<collection> <artist> <name>Robbie Williams</name> <cds> <cd>Rudebox</cd> <cd>Swing when you're winning</cd> </cds> </artist> <band> <name>Juli</name> <cds> <cd>Ein neuer Tag</cd> </cds> </band> <band> <name>Silbermond</name> <cds> <cd>Verschwende deine Zeit</cd> </cds> </band> <artist> <name>Michael Jackson</name> <cds> <cd>Bad</cd> <cd>Thriller</cd> </cds> </artist></collection>
Output the name of the first-listed CD by the last artist in the list.