Possible Clues:

• Julian Lloyd Weber and Jacqueline du Pre, say
• Ma and others
• Some string players
• They won't stand for their instruments being played
• Musicians such as Yo-Yo Ma and Alisa Weilerstein
• People playing large stringed instruments
• They bow as terrorist group gets time in prison
• Players first locked in prison accommodation
• First in the sections they play up in musicals
• They play with the animation unit rosters