滥竽充数

lan yu chong shu: The king of the land adored fine music, and called for an orchestra of hundreds of musicians to play at the palace. Seeing the hordes of musicians getting ready to play, a passerby asked what's going on. "They're all going to play for the king!" The passerby joined the throng, grabbing a bamboo shoot as he walked and fashioning it into a flute on his way to the palace. In the orchestral pit he sat down alongside 100 other flutists, and as they began to play, did his best to mime the flute players beside him. After the performance, he was paid for his fine renditions of the king's favorite songs, having never blown one note.