Professor P plays the 4rd movement: Allegro vivace, of Franz Schubert's Symphony nr. 5, in arrangement for accordion quintet (or larger ensemble) by Paul De Bra.
The arrangement is freely available from https://www.de-bra.nl/arrangements.ht... and from imslp.org and novam.net.
The recording is also available from https://www.de-bra.nl/muziek/Symphony....

Enjoy!