The St. Louis Steady Grinders The St. Louis Steady Grinders are excited to make their first appearance at The Blue Strawberry. The Steady Grinders are a piano/vocal duo that specialize in the low down blues of the 1920s and 30s. Featuring Valerie Kirchhoff (vocals) and Ethan Leinwand (piano), the pair have been entertaining audiences with their uniquely St. Louis style of blues since 2014.