...forthcoming from cpo:
https://www.jpc.de/jpcng/cpo/detail/-/art/kurt-atterberg-cellokonzert-c-moll-op-21/hnum/4465843 (https://www.jpc.de/jpcng/cpo/detail/-/art/kurt-atterberg-cellokonzert-c-moll-op-21/hnum/4465843)
Excellent new! I have all his orchestral music, the cello concert in an Old recording in Música Suecia with the cello sonate If my memory don't fail.
Surely The horn concert is premiere!
Both the Cello and Horn Concertos have been issued on older CDs.
Atterberg - Symphony No. 3 / Concerto for Horn & Orchestra (Albert Linder) - Gothenberg Symphony Orchestra - Sixten Ehrling (Caprice)
Atterberg - Cello Concerto (Werner Thomas-Mifune) / Sonata for Cello & Piano - Rundfunk Sinfonie Orchestra Berlin - Karl Anton Rickenbacher (Koch Schwann)
The 1927 horn concerto indeed's been recorded at least one or two other times, including a recording or two for BIS (and the 2nd movement on an EMI LP). The cello concerto also can or could be found on BIS.
Thank you Erick and Ken!