Grzegorz Kosiński -- Waltz A minor (a-moll), no. 19, opus posthumous (Fryderyk Chopin).
Without a doubt, Fryderyk Chopin is the best and most important Polish composer ever. His works are so hard to play for guitarists and tappers, and that's why my interpretation on 7-string bass is ..different. Scale: D minor (d-moll). Enjoy!