This subseries contains the club's meeting minutes and by-laws, as recorded and submitted by the secretaries of the club. The earliest records (1873-1929) were kept in a bound volume by the secretaries, beginning with Arthur Reed. The volume includes descriptions of meetings, the 1873 act of incorporation, by-laws and subsequent revisions, signatures and addresses of active and associate members, and ephemera (meeting and election notices, newspaper clippings, club rules, etc.). There is a gap in the minutes between 1929 and 1954. Minutes beginning in 1954 consist of loose papers removed from their binder. Included are descriptions of annual meetings, decisions and proposals made, discussions that took place, and club events (rehearsals, concerts, parties, etc.), as well as lists of officers and committee members. This subseries also contains correspondence, account statements, a historical sketch of the club, a probate court citation, competition material, notes, printed matter, and ephemera.

This volume contains the yearly receipts and disbursements of the club, including dues, salaries, expenses, etc. The records were kept by the club's treasurers, beginning with Ben Thewlis. Also included at the end of the book are annual totals, bank account information, and a list of stock shares owned by the club.

This subseries contains both original items and photocopies of materials documenting the history of the club. Included are biographical and historical sketches, sheet music, booklets, early- to mid-20th century newspaper clippings, papers related to singing contests in which the club competed, concert materials (including photocopies of programs), documents related to accompanist and director Florence "Flossie" Dunn's 40th-anniversary celebration, 1903 concert tickets, and miscellaneous print material. The subseries also contains one CD-ROM of the exhibition entitled Ecce Quam Bonum: The Apollo Club, 1871-2009: Boston's Oldest Men's Chorus and a CD entitled Making a Joyful Noise: the Apollo Club of Boston Live in Concert (recorded at Nahant Town Hall, 1 June 2003).

This subseries contains planning material for the 2009 Apollo Club exhibition at the Boston Public Library. The papers consist primarily of photocopies of original 19th- and 20th-century items, such as flyers and program covers; printouts; and other printed material. Also included are drawings of the exhibit layout, images, maps, and a few original historical items. The papers cover many aspects of the history of the Apollo Club and are arranged by subject according to their exhibit case. Cases 7 and 8 contain an inventory of and correspondence related to Apollo Club artifacts.

This subseries consists of loose and bound concert programs of Apollo Club performances. Included in each program are the lyrics of songs performed. Note: Many of the bound volumes are in fragile condition.

This subseries contains published booklets of musical scores for songs performed by the Apollo Club, originally housed in two volumes. Included are two indexes listing the songs by title, composer, arranger, copyright, etc., as well as when and where each song was performed by the club (if known) between 1938 and 1949.

This subseries contains a color map of Boston (1886), an oversize newspaper article about the club (1903), and other oversize printed items removed from the rest of the collection.

These scrapbooks contain printed material and correspondence documenting the daily activities of the Apollo Club and its notable members, including concert performances, meetings, and other events. Included are newspaper clippings, concert programs, notices and announcements, bulletins, issues of the publication Keynote, tickets to performances, and other ephemera related to, and produced by, the club. Note: Many of the scrapbooks are in fragile condition.

This subseries consists of two volumes of Apollo Club concert reviews published in various Boston-area newspapers.