A musician dressed in a suit plays his large instrument while sitting on an amplifier.
A cello player plays his cello while sitting on an amplifier on stage.
Музыкант, одетый в костюм, играет на своем большом инструменте, сидя на усилителе.
Виолончелист играет на своей виолончели, сидя на усилителе на сцене.