Billboard Top 100 Music Player (BTMP) is a desktop client that lets you listen to the Top 100 on your desktop. Without advertisements. For free.
It works by downloading the Top 100 list from the Billboard RSS feed, then uses the Youtube API, youtube-dl, and ffmpeg to download and convert videos to mp3 for each of the Top 100.
The interface is a list of the Top 100, sortable by rank, title, and artist. It is also a fully-capable mp3 player, allowing the user to listen to the list.
There are a bunch of other places you can go to listen to Top 100 music, including the Billboard website. You could even turn on the radio. The advantage of BTMP is that it provides a clean interface with a minimum featureset. It's also free/libre and open source.