56 keys Perlee

 The information you need is here: Cardboard book width= 21cm.  Distance from back edge (furthest away from operator) to centre of first hole=10mm.   1.  Bass drum2. F (highest note)   Melody3. E4. D5. C#6. C7. B8. A#9. A10. G#11. G12. F#13. F14. E15. D#16. D17. C#18. C19. B20. A#21. A22. G#23. G 24. F#.      Accomp. 25. F26. E27. D#28. D29. C#30. C31. B32. A#33. A34. G 35. F          Bass36. E37. D38. C39. B40. A#41. A42. G 43. Tremelo44. Snare drum45. Cellest46. Snare drum47. - - - - - - - - - - - 48. Declanche49. Violin50. Wood block51. Wood block52. Trombone53. Bourdon54. Dirigent (Band master)  I hope this is all clear and understandable!