I've realized that there are lots of singers and bands, it's impossible to count them. But let's try :p
It goes like that: I'll start the counting, then you'll add another artist. Don't write a band, but do write what band an artist sings for. Copy the previous list each time you add an artist, so we can see them and not write one twice. I hope it works! :D
Note: You can add only once an hour

1. Nicole Sherzinger (Pussycat Dolls)