"Canción", the main theme performed with natural harmonics in the second verse (like in this video) works only with high C tuning.
Sheet music of "Siete canciones populares Españolas" for solo double bass in three scordaturas is meanwhile available as PDF file in online shop of my website (for GDAE, AEBF# and cGDA like performed here).
Live recording, 11 Oct 2019 in Museum Tuppenhof, Kaarst (D) Project "Danza", of the Niederrhein Musikfestival 2019
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