Gāngqínjiā zài táishàng de jíxìngzhīzuò ràng quánchǎng jīngyàn.
The pianist's onstage improvisation amazed the entire audience.
Tips
usage
Use 即兴之作 for any artistic work made on the spot - poetry, music, calligraphy, painting. For improvised speech use 即兴发言; for improv comedy/theater use 即兴表演.
