The materials within this series date from 1895 through 1985 and are arranged into four sub-series: Subseries I. Major League Baseball; Subseries II. American League; Subseries III. National League; and Subseries IV. Other Leagues and Teams. Sheet music in this series provides excellent documentation of the close relationship between baseball and popular music, especially in the early 20th century. Sheet music is arranged alphabetically within each sub-series, and when appropriate, by team name. All music about individual players or groups are arranged with the team they are most clearly identified with. Music about individuals with no clear team relationship (such as Mel Allen and Billy Sunday) are arranged within sub-series IV (Other Leagues and Teams).