That Wolf At The Door is a collaborative 2 CD between Henry Kaiser (Califonia, USA; guitar) and P.ST (Prague, Czechia; electronics). The first CD That Wolf At The Door is a solo baritone guitar disc that pays a heartfelt tribute to the late science fiction author Gene Wolfe (May 7, 1931 - April 14, 2019). The album is a testament to the decades-long friendship and mutual appreciation between Wolfe and Kaiser, two creative minds who shared a passion for pushing the boundaries of their respective art forms. With novels often as complex and extraordinary as Cecil Taylor's best piano playing.

Wolfe is one of Kaiser's favorite writers of all time. On this disc, Kaiser's guitar storytelling and narratives
were consciously and intentionally influenced by Wolfe's writing. The baritone guitar, with its longer scale length, typically larger body, and lower tuning than a regular guitar, is an intriguing instrument. It is often pitched halfway between the lowest note of a bass of a regular guitar, adding a unique depth and resonance to the sound. Henry Kaiser has been playing baritone guitars for over 30 years, and
this is his second CD, after 2024's The Lost Chord, which is all baritone.

The solos here are free-improvised, live, in real time, with no overdubbing. Various extended techniques, both manual and electronic, were employed to create polyphonic and orchestral textures. Many of Kaiser's musical heroes - Terry Riley, Cecil Taylor, Derek Bailey, Iannis Xenakis, Rockette Morton, Conlon Nancarrow, Barry Guy, Rakotozafy, D'Gary, Evan Parker, and György Ligeti - inspired the solos on this disc.