Commonly referred to as the 'Cello-Guitar', the Brahms guitar was invented in 1994 by Paul Galbraith in conjunction with the recently deceased luthier David Rubio. It was originally conceived in order to perform Brahms' Theme and Variations Opus 21a. The instrument has eight strings, adding both a high and a low string to the conventional six string guitar. The tuning continues in fourths and the frets are splayed to allow for the different string lengths. Galbraith's method is to play the Brahms guitar in the cello position adding greater freedom to both hands and incorporating a resonating box.

Redmond is the first in the world to have adopted Galbraith's groundbreaking new technique. After seeing Galbraith perform at the Dundee guitar festival in 2000 he had Irish Luthier Patrick O'Toole (also his uncle) build a Brahms guitar and within a year adopted the Cello position with the help of Alexander technique expert and Violin teacher at the Dublin Conservatory Brian McNamara.