Toshi Kasai is a Japanese record producer, engineer, mixer and musician.

In 2019, he opened for Melvins and Redd Kross under his own name, playing Moog Synthesizer to oscilloscope and projections.

On March 12, 2020 Joyful Noise Recordings announced the release of his project: Plan D. It was received with favorable coverage from outlets such as Rolling Stone[8] and others:[9][10] "From his LA studio, Toshi created a complex drum-triggering system which is the catalyst for Plan D. He then spent the last several years luring drummers into his Sound of Sirens studio, letting them go nuts behind the kit.

The result is some of the craziest sounding prog-like instrumental music you're likely to ever hear.

"included on the project are drummers: Toshi Kasai has worked with the following musicians and groups.