Caprice Records released CD ”Nicolaus Zwetnow. Balalajka” with Eduard Tubin’s Concerto for balalaika and orchestra, performed by Nicolaus Zwetnow and Royal Stockholm Philharmonic Orchestra with Kjell Ingebretsen conducting; recorded in 1979.
https://trove.nla.gov.au/work/25750760?q&versionId=31026929
https://musikverket.se/capricerecords/artikel/tubin-balalaika-concerto/