HANOI — Traditional Korean folk music rang out across the campus of the University of Social Sciences and Humanities at Vietnam National University, Hanoi, Saturday. Samulnori, a traditional Korean percussion performance that has largely disappeared from university campuses in Korea, was brought back to life by Vietnamese students in the heart of a Hanoi campus, performed by students in the Korean language department’s troupe. The performance opened the “Vietnam Central and Northern Universities Korean Language Department Festival,” organized by the Embassy of the Republic of Korea in Vietnam and the Korea Foundation. The festival, which began in 2010, provides Korean language students with opportunities to interact and exchange ideas. The 15 students, dressed in traditional Korean pants and jackets with vests and colorful sashes, each held a traditional drum or gong as they delivered an energetic performance. Whenever they sang songs such to the rhythm, some 300 spectators responded with enthusiastic applause. Mai Thuy, 21, the troupe’s leader, said after the performance that