- Grant Gustin (Barry Allen / The Flash)
- Candice Patton (Iris West-Allen)
- Danielle Panabaker (Khione)
- Danielle Nicolet (Cecile Horton)
- Kayla Compton (Allegra Garcia)
- Brandon McKnight (Chester P. Runk)
- Jon Cor (Mark Blaine / Chillblaine)
The Flash — S0E44
Episode: Harmony in a Flash
Air Date: 2017-05-23
Runtime: 15 min
Overview
Composer Blake Neely's journey arranging Duet's score. Season 3 featurette.