Plug - Lightweight OSX player for Hype Machine
Vinyls - Vinyls is a music player that lets you listen to your music without any complicated setup.
Magic Playlist - Get the playlist of your dreams based on a song
Plexamp - A small music player with a number of unique features
Playlist Hunt - Playlist Hunt is one of the best applications for Apple users to get the best music through it.
SoundCloud Charts - The most played tracks on SoundCloud this week