 The Lim Festival, about 20 kilometers away from Hanoi, Lim village of Bak Ninh province, is the hometown of Kuan Ho Folk Songs, one of Vietnam's intangible cultural heritage. Kuan Ho Bak Ninh is Folk Songs of Red River Delta, concentrates mainly in Kin Bak region, provinces of Bak Ninh and Bak Young. This is a kind of art composed by the elements of music, lyrics, costume, and festival. Kuan Ho Bak Ninh Folk Songs show close-knit relation between male singers, the Lien An, and female singers, Lien Chi, and our typical culture of Kin Bak region's people. Kuan Ho Folk Songs pass from generation to generation through oral tradition and have the most melodies in Vietnam's Folk Song genres. Kuan Ho Folk Songs are always performed voluntarily in groups of male, Bon Nam, or female Bon Nu. Each group usually has four to six people who are named by others such as second sister, third sister, fourth sister, or second brother, third brother, fourth brother, and so on. If the size of a group reaches seven or eight people, then they are divided into older siblings and younger siblings, named as third older sister, third younger sister, or third older brother, and third younger brother. Kuan Ho Folk Songs are alternating response songs between the groups of male and female. A group of female from one village sings with a group of male from another village with similar melodies but different lyrics and always with alternating tunes. In each group, one person sings the leading tune and another sings the secondary part, but the two should be in perfect harmony and not the same timbre. Kuan Ho Folk Songs have 213 different melody variations and more than 400 song lyrics. A song lyric includes two parts and that is the text is the core of the song containing its base lyrics and the lyrics of Kuan Ho Folk Songs derived from poems and folk verses of the Vietnam mostly six syllable and eight syllable verses modified six syllable and eight syllable verses and four syllable or mixed four syllable verses express people's emotional states in metaphorical language. And the secondary text includes words that are added to melodies such as Kuan Ho Folk Songs exist in a cultural environment with their own social customs. The first is friendship customs among Kuan Ho villages. From the friendship custom, a special social custom appears among Kuan Ho groups, its friend making custom. Each Kuan Ho group from one village makes friends with another group from another village following the principle that male groups make friends with female groups and vice versa with friendship partner villages men and women in Kuan Ho groups from these villages are now allowed to marry each other. One particular characteristic of Kuan Ho singing is the teaching and the dissemination through sleepover custom. Boys and girls from 9 to 16 or 17 years old invite each other to sleep over in their host's house to learn Kuan Ho singing techniques. Male and female singers combine and practice their voices in pairs in order to have a unified timbre for performance. Kuan Ho gastronomy uses phoenix wing shaped quid of betel and areca. Thai Nguyen Thi in meal it must use red tray or what they call us mam son which is made of timber and painted red to express host's emotion to visitors. Dishes in the meal depend on each village's custom but most include a plate of chicken, two plates of lean pork, paste lean pork especially no fat dishes to avoid damaging voice. In performance the outfits of Kuan Ho are distinctive. The female costume includes nantong ko tau the large round Kuan Ho hat and the scarf for wrapping the hair comes sold tunic skirt scarves dyed about the waist and slippers and the male costume includes turban umbrella, shirt or robe including undershirts and long tunics with five pieces trousers and slippers. In order to enhance and promote the tradition of Kuan Ho singing limb festival is eagerly celebrated among local residents as well as pilgrims from every part of the country around the 12th to the 13th day of the first lunar month. Originally limb festival aimed to worship Bamu a child of Noi Du Hamlet who led her religious life as a Buddhist nun at limb pagoda. After acquiring enlightenment Bamu protected all residents within limb village from a severe drought. As a result limb villagers glorified Bamu as their guardian and the enlightenment date of hers was taken to be the celebration day of limb festival. Apart from watching performances of Kuan Ho festival goers can experience weaving competitions among the girls of Noi Du Hamlet. Simultaneously they weave and sing Kuan Ho other traditional games such as human chess playing, swinging wrestling and goat catching are also held in the festival.