HONG KONG — A 140-member North Korean pop orchestra will stage rare performances in South Korea during the Winter Olympics next month, the two Koreas agreed on Monday. The two sides discussed details of the North’s participation in the Games as part of their efforts to improve ties.

The orchestra, known as the Samjiyon Band, one of the North’s top arts troupes, will enter South Korea by crossing over at Panmunjom, a border village, and will perform twice in the South: once in Seoul, the South Korean capital, and once in Gangneung, a city on the east coast where some of the Olympic competitions will be held.

The troupe’s performances will feature 80 orchestra musicians and 60 members who sing and dance. Many of them are young women who have been allowed to adopt a more lively style and modern costumes, like short skirts, under the North’s young leader, Kim Jong-un.

But like all art troupes in the North, Samjiyon remains a tool of propaganda for Mr. Kim’s government, which uses music, movies, paintings and novels to disseminate the state’s ideology and inspire loyalty to its leadership. It and the better-known Moranbong Band have performed in numerous state art performances where Mr. Kim’s policies, as well as his missile and nuclear tests, have been celebrated.