Bertha Johanne Feiring Maass Tapper (25 January 1859 – 2 September 1915) was a Norwegian composer,[1] pianist,[2] and teacher,[3] best known for editing the piano works of Edvard Grieg for publication in America.

Tapper was one of nine children born in Christiania, Norway, to Berthe Iversdatter and Lars Olsen Feiring.

She married Carl Ludvig Otto Maass and they had a son (Louis) and a daughter (Klea).

[10] Although Tapper was a composer,[4][1] she is best known for her editions of Grieg’s piano works published by Oliver Ditson.

Ditson’s ad in a 1910 Boston Symphony program for Grieg’s Piano Lyrics and Shorter Compositions edited by Tapper noted that “The editor is in sympathy with the composer's genius and has performed her task with care for details and insight into the characteristic idiom which makes Grieg's music almost synonymous with Norwegian composition.”[11] Tapper contributed an article, “Mastering Piano Problems,” to the book Piano Mastery by Harriette Brower (Oliver Ditson 1911).