From the Facebook event description:

The Gaslight Squares are a St. Louis based jazz band, dedicated to preserving early styles of jazz, blues and ragtime, through live musical performance along with education. After a year of very limited live performances the band are excited to have prepared a special show for the Focal Point’s Livestream series. They will debuting a whole host of new arrangements from the Ragtime age to the Swing era.

For this night the band will consist of cornetist T.J. Muller, reed players Ryan Calloway and Kellie Everett, pianist Christian Frommelt, guitarist/banjoist Jacob Alspach and bassist Joey Glynn.