Simplify the following text for a Grade 7 native English-speaking person.
Original: In Wallonia the most important charts are the Ultratop 40 singles and the Ultratop 50 albums ( the two versions of Ultratop 50 albums are separate ) .
Simplified: In Wallonia the most important charts are the Ultratop 40 singles and the Ultratop 50 albums .