If you're interested on hearing more of Alexander, there are some pieces that I have transcribed:
Violin Sonata Op.28 No.1 (Preview): https://musescore.com/user/118853069/scores/32976839
Konzert Walzer Op.50: https://musescore.com/user/47292881/scores/33905723
"Ahasver" Piano Sonata Op.57 No.7: https://musescore.com/user/47292881/scores/31956257
"Er ist Gekommen" Lied Op.137 No.1: https://musescore.com/user/47292881/scores/32623532
"Badener" String Quartet Op.173 No.1 (Mvt.1): https://musescore.com/user/47292881/scores/22924522
"Badener" String Quartet Op.173 No.1 (Mvt.1,2 3): https://musescore.com/user/118853069/scores/32976974
Piano Sonata Op.196 No.36: https://musescore.com/user/47292881/scores/32181755
Triolett Op.219b: https://musescore.com/user/47292881/scores/34081367
Prelude for Organ Op.226 No.1: https://musescore.com/user/47292881/scores/20997742
I'm also working on his Dedication Op.206b, Piano Concerto Op.212 No.3, Choral am Morgen and Skizzen-Buch Op.143
Sorry but I had to remove all the videos from mt YT account (well excepting one) so you should see my digital realisations on my MuseScore profile page