Back in 1986, composer Laurie Spiegel created a groundbreaking program that turned the computer into a playable musical instrument.
Four decades later, Eventide has rebuilt Music Mouse for modern musicians and producers, and the result is one of the most unusual and inspiring MIDI controllers we’ve tested in a long time.
Music Mouse is a standalone software instrument that generates melodies and harmonies from your mouse cursor. Move across a grid of pitches and its four voices respond in real time, each locked to one of six built-in harmony modes, spanning Chromatic, Octatonic, Middle Eastern, Diatonic, Pentatonic, and Quartal scales.
You don't need to know music theory, and you don't need keyboard skills: the software's built-in musical intelligence keeps everything harmonically in shape while you focus on movement and expression.
Keyboard controls let you adjust voicing, articulation, motion, and rhythmic treatment on-the-fly while you play, and the onboard pattern sequencer can layer preset algorithmic phrases on top of your cursor movement. As a standalone instrument, Music Mouse comes with 32 retro-inspired sounds designed by Spiegel herself, and it launches instantly - just open it up, connect the mouse, and you're playing.
Where things get really interesting is the MIDI output. Switch Music Mouse to MIDI mode and it creates a virtual MIDI port that shows up in your DAW just like any hardware controller. Route it to a software instrument in Ableton Live, Logic Pro, or any MIDI-enabled DAW, and suddenly you're intuitively controlling synths, samplers, and anything else in your session with mouse movements.
In the video at the top of this page, we demonstrate Music Mouse triggering Ableton's Collision device and Serum 2, showing how different instruments respond to its fluid and unpredictable output.
It works with hardware, too. Also in the video, we route Music Mouse to an Elektron Analog Four to show it controlling an analogue polysynth in real time. The setup is straightforward – Music Mouse's MIDI output goes to your hardware synth, and every cursor movement triggers notes on the hardware’s internal sound engine. Any MIDI-capable synth will work the same way.
One thing worth highlighting is how Music Mouse's output interacts with effects. Because the melodic content is constantly shifting rather than looping, effects like delay, reverb, and granular processing respond in a much more alive, evolving way than they would to a static sequence. It's a simple thing to set up - just add effects to your signal chain - but the results can be genuinely surprising.
Music Mouse occupies a space that nothing else really does. It's not a step sequencer, it's not a generative plugin, and it's not a traditional MIDI controller. It's an instrument in its own right, rewarding exploration and making it easy to stumble on musical ideas you'd never arrive at any other way.
Music Mouse is available now from Eventide for $29.