Musical employment can take many forms. Some musicians spend their careers in symphony orchestras.  Some make a living performing in theaters in New York and Las Vegas, and some may find employment on the road with big bands. In each case, the thrill and sometimes disappointment is worth all of the hours and day one has spent in practice rooms around the country, and world. One segment of music which seldom is talked about is the working studio musician, and one of the best was Mr. Don Thomas. I have written previously about this trumpet legion but recently I came…