If you have good chance to use VLC Media Player for viewing videos or music without any subtitles or voiceover, then you can use it to create a visualizer. There are some different Visualizers for VLC Media Player available online, including a Spotify visualizer and a GrooveShark visualizer. You can create a small Visualizer for VLC Media Player in just a few minutes. Just paste the code into the Visualizer's blank space and you're done. The grooveshark visualizer plays the given song and displays the visualization for it. You can also view other visualizer's visualizations, such as the Spotify visualizer and the GrooveShark visualizer, from the Visualizer's blank space.
Here is an example. I create a visualizer in the VLC player by using this code in the Visualizer's blank space.