Who led a successful big band during the era of cool jazz?

One common issue facing those who work to conserve works of art is:

A. the effect of light. B. the work of earlier restorers. C. changing levels of heat and humidity. D. pollution. E. All of these answers are correct.

We can apply letter names (A, B, C, etc.) to notes in Western music if they have

A. timbre. B. frequency. C. determinate pitch. D. indeterminate pitch.