You can find the PDF version (in both Spanish and English) through several digital libraries and educational platforms: Elementary Training for Musicians (Hindemith, Paul) - IMSLP
: Intensive focus on internalizing time through physical and mental exercises. adiestramiento elemental para musicos paul hindemith pdf
[Conclusión - Todos] Em - B7 - C - G
(originally published in English as Elementary Training for Musicians ) is widely considered one of the most rigorous and effective textbooks on musicianship ever written. You can find the PDF version (in both