Conversation so far:
What is one Nightwish major chart topping success?
Wish I Had An Angel is Nightwish most popular single in Europe and in the United States.
What year did Nightwish's Nemo release?
A new Nightwish album, Once, was released on June 7, 2004, along with its first single, Nemo.
What was another country that Nightwish's Nemo reached the charts in besides the US?
The single Nemo by Nightwish topped the charts in Finland and Hungary.
Is there any interesting information on Nightwish besides Nemo and Wish I Had An Angel?
Nightwish is the most successful Finnish band worldwide, selling more than 9 million records.

Question: How many albums did they come out with in 2004-2005?
Self-contained rewrite: How many albums did Nightwish come out with in 2004-2005?