Song plugger

A song plugger or song demonstrator was a vocalist or piano player employed by department and music stores and song publishers in the early 20th century to promote and help sell new sheet music, which is how hits were advertised before quality recordings were widely available. Music publisher Frank Harding has been credited with innovating the sales method. Typically, the pianist sat on the mezzanine level of a store and played whatever music was sent up to him by the clerk of the store selling the sheet music. Patrons could select any title, have it delivered to the song plugger, and get a preview of the tune before buying it.