O`lan is a genre of people's oral creation. Mainly, it is performed by women with or without doira accompaniment. At Uzbek parties and celebrations, the O`lan is sung by a girls' team on one side and a boys' team on the other side, or it is sung by two people who take opposing sides so they can perform as though they are having a dialogue. Yor-yor is a folk song performed at a wedding celebration when the bride is seen off. In ancient times, it was widespread among Uzbek, Tajik, Uygur, and Turkmen people. Yor-yor consists of two or four lines; at the end or in the middle of each line are the words 'yor-yor, aylanaman' (my beloved one, I am enchanted). Usually, yor-yor is accompanied by doira music performed by women. The high effect of yor-yor is that it simultaneously harmonises sadness with a merry melody, tone, and the mood of holiday joys. In yor-yor songs, the bride's features, wishes, cherished dreams, and congratulations to her are praised. The Republican Scientific and Methodological Center of Folk Art under the Ministry of Culture and Sports of the Republic of Uzbekistan, in cooperation with the National Commission of the Republic of Uzbekistan for UNESCO, organised an expedition to Ferghana Valley to research and classify intangible cultural heritage samples as well as to inventory and define the bearers of this heritage. The expedition team recorded samples of O'lan songs from ICH bearers and transmitters of intangible cultural heritage, including Xayrullo Mirzayev, Hanifa Mirzayeva, Inoyat Rafiqova, Makhbuba Yo'ldosheva, Baxtiyor Turg'unov, Zebikhon Abdunazarova, Ko'paysin Oqboyeva, and Qo'zikhon Siddiqova.