Would anyone like to join my roleplay re. mind class?

I have a link

What refers to the distance between two sound frequencies or pitches?

What is the key to finding personal fulfillment in your job a. to have high salary b. to engage in lifelong learning c. to interview people in the field d. to reevaluate your career choice annually

1. which one of the following is not one of the instrument families in the standard symphony orchestra? strings woodwinds brass sopranos