This article originally appeared in TidBITS on 2015-06-12 at 8:24 a.m.
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FunBITS: Be a VJ with the iTunes Visualizer

by Alexandre Leroux

There’s an underused gem of creative software installed on hundreds of millions of computers worldwide: iTunes. Yes, that’s right, iTunes. You may have thought it was just a media player, or perhaps a management utility for your iOS devices, but it has a little-used visualizer that can enable anyone to create stunning animations.

Here’s how to have fun with iTunes’ built-in visualizer and become a VJ — VJing being described [1] as creating a “real-time visual performance.” Once you’re aware of a few important facts and tips, it becomes a joyful experience to control beautiful and colorful live 3D animations, with nothing required other than iTunes and music you love.

In 2001, Apple licensed and integrated a special version of SoundSpectrum’s G-Force visualizer [2] into iTunes. In September 2008, Apple introduced the current default built-in visualizer in iTunes 8 (see “iTunes 8 Adds Genius; iTunes Store Adds HD TV and NBC [3],” 9 September 2008). What you may not realize is that what is today’s default visualizer was originally a third-party plug-in named Magnetosphere and developed by The Barbarian Group [4]. The iTunes version of this visualizer has not evolved much since then.

What’s wonderful about the iTunes visualizer is that you can control — in real-time — a number of its components, such as the type of visualization and its colors, brightness, rotation, and other factors, enabling you to create surprisingly nice animations. To dive into the experience, start a song in iTunes and press Command-T, which brings up the default iTunes visualizer. Pressing ? reveals a few keyboard commands, but not all. The following table lists all of the iTunes visualizer’s keyboard commands.

[image link] [5]

Now that you know which keys to press, it’s time to learn how to leverage those controls to enhance the experience. While I can’t help you with the artistic process of creatively tapping the M, L, F, N, and P keys in rhythm with the music to create something beautiful, I can tell you what I found about the mechanics of the visualizer. There are three main visual components: the cores, which are the moving spheres; the rays, which flow out of the cores; and the nebula clouds, which fill the whole screen and impact the ambiance.

Here are a few tips:

To demonstrate some of what you can do, I’ve created a few sample videos based on music I improvised with the award-winning Animoog [6] app for iPad ($29.99). Music made on mobile devices is quickly growing in popularity with tons of innovative musical instruments disguised as apps being available for iOS. The Animoog solos accompanying the videos are not exactly Top 40, but the album has been featured by Moog Music [7] and got some positive reviews. That said, you should try the visualizer with some of your favorite songs from different genres.

In my first video [9], I did not use the recipe I explained above and thus the animations often appear distant and don’t fill the screen, offering an arguably less enveloping experience. My second video [10] shows more cases where the action is set closer to the viewer, filling the whole screen. The third demo I created for this article goes to the extreme — I locked the cores close to the view and essentially played with the mode (M) and freeze (F) controls alone while never unlocking rotation. The resulting animation exhibits less variety but fills the screen the whole duration.

You have everything needed to record similar videos of your own iTunes visualizer performances. The approach I used involves recording the screen with QuickTime Player (File > New Screen Recording; I had to lower the display resolution in System Preferences to avoid stuttering), and then editing the video and audio track in iMovie with one of its default themes.

While there are many third-party music visualization tools available for OS X and iOS (my favorite being Uzu [11]), iTunes is nearly ubiquitous and is perfect for getting a taste of what can be done. Magnetosphere continued to improve for a while outside its iTunes version, as demonstrated by these two 2010 Magnetosphere videos [12] by Robert Hodgin, a former member of the development team. Although Apple hasn’t updated the iTunes visualizer in seven years, I hope the company eventually sees value in releasing an updated version. Meanwhile, the current visualizer is there to liberate your inner VJ.