Otto Forberg's steady output is shown by its HMB entries: 733 items for the period 1888-1898, and 116 in 1893-98. However, this was small compared with the 3000 items of Robert Forberg for 1862-1900. The catalog included lighter items by Gustav Lange and Erik Meyer-Helmund, violin works by Hans Sitt and Gustav Hollaender, and many piano works by Adolf Ruthardt and Arnold Krug.
Otto Forberg's plate numbers were issued in a regular chronological fashion. Plate numbers are in the format of #### . Dates in italics are estimated.
|1502-3||Wilm||2 Vortragsstücke, Op.79||1889|
|1996||Eilenberg||Rêve du bal, Op.155 (arranged pf.duet)||1894|
|2552||Berger||Piano Sonata, Op.76||1899|
|2667||Sitt||Romance, Op.72 (va, pf red.)||1900|
|3012–3||Reger||2 Compositions for Violin and Piano, Op.87 (nos.1,2)||1905|
|3034-43||Lazarus||Aus fremden Ländern, Op.107||1906|