1. Jacobs A. Dictionary of Music. 6th edn. London, Penguin. 1996. 512 p.

2. New York Public Library Science Desk Reference / ed. by P. Barnes-Svarney. McMillan USA, Stonesong Press. 1995. 668 p.

3. Number Bases calculator. Available at URL: http://convertxy.com/index. php/number bases/

4. Claudii Ptolemaei Opera quae exstant omnia, Syntaxis Mathematica / ed. J.L. Heiberg. II vol., IV pars. Lipsiae, B.G. Teubneri. 1898, 1903. [Claudius Ptolemy All The Works that stand out are Mathematical Syntax / ed. J.L. Heiberg. In II vol., IV parts. Leipzig, B.G. Teubneri. 1898, 1903]. (In Latin).

5. Available at URL: http://pianomaker.co.uk/technical/string_formulae/

6. Arto’s string calculator. Available at URL: www.cs.helsinki.fi/u/wikla/mus/ Calcs/wwwscalc.html

7. Piano pitch frequency calculator. Available at URL: http://shakahara.com/ pianopitch2.php

8. Iamblichus’ Life of Pythagoras / trans. from the Greek by T. Taylor. Rochester, Inner Traditions. 1986. 272 p.

9. Bruscia K.E. Defining Music Therapy. 2nd edn. Gilsum, Barcelona Publishers. 1998. 300 p.

10. Bradt J., Dileo C., Potvin N. Music for stress and anxiety reduction in coronary heart disease patients. Cochrane Database Syst Rev. 2013; (12): CD006577. DOI: https://doi.org/10.1002/14651858.CD006577.pub3.

11. The Johns Hopkins Medicine. Music as Medicine. Available at URL: www.hopkinsmedicine.org/center-for-music-and-medicine/music-as.medicine.html

12. Major health benefits of music uncovered. The neurochemistry of music. Published: 27 March 2013. Available at URL: www.mcgill.ca/newsroom/channels /news/major-health-benefits-music-uncovered-225589

13. Available at URL: www.sgae.es/es-es/sitepages/EstaPasandoDetalle Actualidad.aspx?i=2050&s=5

14. Abbey E., Reid J.S., Ji S. Can music influence the longevity of human blood cells? Available at URL: https://experiment.com/projects/can-music-influence-the-longevity-of-human-blood-cells

15. Doczi G. The Power of Limits: Proportional Harmonies in Nature, Art and Architecture. Boston, Shambhala Publications. 2005. 160 p.

16. Institute for Frontier Science. Available at URL: http://frontiersciences.org

17. Available at URL: http://brubik.com

18. Schellenberg E.G., Trehub S.E. Natural Musical Intervals: Evidence from Infant Listeners. Psychological Science. 1996; 7(5): 272-277.

19. Sonocytology. Available at URL: https://www.darksideofcell.info/about. html