Craig Frost (born April 20, 1948, Flint, Michigan) is the keyboardist for Bob Seger's Silver Bullet Band. He is also known as keyboardist for 1970s hard rock band Grand Funk Railroad.Frost expanded Grand Funk's "power trio" musical style, by adding another dimension to their music. Grand Funk scored its biggest hits after Frost joined the band in 1972, and his work is instantly recognizable on Grand Funk's #1 songs "The Loco-Motion" (a cover of Little Eva's hit) and "We're An American Band".