Windows/Mac/Linux: Soundcloud is a fantastic repository of music, but the web site isn't exactly a joy to browse. If you prefer desktop app for this type of thing, Soundnode's exactly what you're looking for. At a glance, Soundnode looks a lot like Spotify and works similarly. You can easily play tracks, create playlists and search for new music. As you'd expect, native media keyboard shortcuts also work in the app. Right now, it doesn't seem like you can comment on tracks, but as far as actually listening to music, Soundnode does the job well.