Why is there a choice between white or black VELCRO® brand fabric backing?
The white fabric backing would be used for single line staff, display of stem notation and clarification of pitch organizing tools (such as hand signs, sol-fa letters and labeling of resonator bells). The black fabric backing would be favored for convenient presentation of Rhythm cards, as the black background would serve to indicate barlines by leaving a space between cards (grouped to form given meters). White meter numerals would be applied in this case. Two or more panel sections could be divided between white and black fabric backings. (The white backing could also accommodate rhythm cards with addition of barlines).
