Answer:
Currently, the Detroit Symphony Orchestra does not have a percussion section. Because of the DSO management's lack of cooperation in settling the musicians' strike, the percussion section auditioned for various other orchestras and have departed from Detroit. Jacob Nissly, the principal percussionist, is relocating to Clevelan; Brian Jones, the principal timpanist, is moving to Dallas; and Ian Ding, the assistant principal, is leaving for Minneapolis. The fourth spot, assistant principal timpanist, has been vacant since 2009.