Simplify the following text for a Grade 6 native English-speaking person.
Original: The album reached # 21 on Billboard 's Pop Albums chart , and is on the list of the top 100 best-selling albums of the 1980s .
Simplified: The album reached # 21 on the Billboard 200 chart , and is on the list of the top 100 best-selling albums of the 1980s .