The Musical Quarterly, the oldest academic journal on music in the U.S., was founded by Schirmer in 1915 together with musicologist Oscar Sonneck, who edited the journal until his death in 1928. In 1964, Schirmer acquired Associated Music Publishers (BMI) which had built up an important catalog of American composers including Elliott Carter, Henry Cowell, Roy Harris, Charles Ives, Walter Piston, and William Schuman, adding to a Schirmer's ASCAP roster which had already included Samuel Barber, Leonard Bernstein, Morton Gould, Gian Carlo Menotti, and Virgil Thomson, as well as composers from the earlier part of the century such as Charles Tomlinson Griffes, Charles Martin Loeffler, John Alden Carpenter, and Percy Grainger.
The Musical Quarterly, a prominent journal focusing on music in the United States, was established by Schirmer and musicologist Oscar Sonneck in 1915. In 1964, Schirmer acquired Associated Music Publishers (BMI), which expanded their catalog of American composers to include notable figures like Elliott Carter, Henry Cowell, Roy Harris, Charles Ives, Walter Piston, and William Schuman. This acquisition further enriched Schirmer's ASCAP roster, which already featured prominent composers such as Samuel Barber, Leonard Bernstein, Morton Gould, Gian Carlo Menotti, and Virgil Thomson, along with earlier-century composers like Charles Tomlinson Griffes, Charles Martin Loeffler, John Alden Carpenter, and Percy Grainger.