IPod help: Multiple artists?

So i have multiple songs for the same artist. I recently downloaded another one of their songs and put it on my ipod. However, i've run into a problem. The song is seperated from all the other songs of the same artist. So when i go through my ipod, it says "The Veronicas" (spelled exactly the same) twice. I went through the info and made everything match. Still, no luck. Any ideas on whats wrong?