Rongali Bihu (mid-April, also called Bohag Bihu), the most popular Bihu celebrates the onset of the Assamese New Year (around April 15) and the coming of Spring. This marks the first day of the Hindu solar calendar and is also observed in Bengal, Manipur, Nepal, Orissa, Punjab, Kerala and Tamil Nadu though called by different names. It's a time of merriment and feasting and continues, in general, for seven days. The farmers prepare the fields for cultivation of paddy and there is a feeling of joy around. The women makepitha, larus (traditional food made of rice and coconut) and Jolpan which gives the real essence of the season. The first day of the bihu is called goru bihu or cow bihu, where the cows are washed and worshipped, which falls on the last day of the previous year, usually on April 14. This is followed by manuh (human) bihu on April 15, the New Year Day. This is the day of getting cleaned up, wearing new cloths and celebrating and getting ready for the new year with fresh vigor. The third day is Gosai (Gods) bihu; statues of Gods, worshiped in all households are cleaned and worshiped asking for a smooth new year.
The folk songs associated with the Bohag Bihu are called Bihugeets or Bihu songs. The form of celebration and rites vary among different demographic groups.
Rongali Bihu is also a fertility festival, where the bihu dance with its sensous movements using the hips, arms, etc., by the young women call out to celebrate their fertility. In this aspect, the bihu dance can also be called a mating ritual by the young men and women.
- Goru Bihu
- The goru bihu or cattle worship rites are observed on the last day of the year. The cattle are washed, smeared with ground turmeric and other pastes, struck with sprigs of dighalatiand makhiyati and endeared to be healthy and productive (lao kha, bengena kha, bosore bosore barhi ja/maar xoru, baper xoru, toi hobi bor bor goru—eat gourd, eat brinjal, grow from year to year/your mother is small, your father is small, but you be a large one). The old cattle ropes are cast away through the legs and new ropes are tied to them, and they are allowed to roam anywhere they wished for the entire day.[2]
- Manuh Bihu
- The New Year day, the day after the goru bihu, is called the manuh bihu. Elders are shown respect, with gifts of bihuwan (a gamosa), a hachoti (kerchief), a cheleng etc., and their blessings are sought. Children are given new clothes, and Husori singing begins on this day, and people visit their relatives and friends.[3]
- Husori
- Village elders move from household to households singing carols, also in the style of bihu geets, called husoris. It possibly derives from the Dimasa Kachari word formation ha (land) and char (move over): hachari.[4] Villages could have more than one Husori band, and they would visit households in a village non-contiguous to itself, first singing carols at theNaamghar. The husari singers then visit individual households, by first announcing their arrival at the gate (podulimukh) with drum beats. The singers are traditionally welcomed into the courtyard where they sing the husori songs and perform a ring dance. At the end of the performance they are thanked with an offering dakshina of paan (betel leaf) tamul (areka nut) in a xorai (brass dish with stand), whereupon the singers bless the household for the coming year. If there is a bereavement in the family, or the family does not invite the husori singers due to an illness, the husori band offers blessings from podulimukh and move on. Generally the singers are all male.[5]
- Fat Bihu
- This is a very old form of Bihu, characterized by spontaneity, popular in the Lakhimpur area of Assam. According to legend, the first Ahom king, Sukaphaa, traveled to the region to watch it in the early 13th century.[6]
- Beshma
- This is celebrated by koches , in this festival 'bhurbhura','shak' are marrimaking and festing,
- Mukoli Bihu
- Young unmarried men and women attired in traditional golden silk muga dance the bihu and sing bihu songs in the open fields. The songs have themes of romance and sexual love, requited or unrequited. Sometimes the songs describe tragic events too, but treated very lightly. The dance celebrates female sexuality.
- Jeng Bihu
- This is Bihu dance and song performed and watched only by women. The name "jeng" comes from the fact that in earlier days women in the villages used to surround the place of their performance with sticks dug into the ground called jeng in Assamese. It is also called gos tolor bihu (Bihu beneath tree).
- Baisago
- The Bodo-Kachari people celebrate for seven days—the first day for cattle (Magou), the second day for man (Mansoi) and ancestor worship, feasting, singing and merriment. Songs follow the same themes as the Bihu songs.[7]
- Bihutoli Bihu
- The rural festival made its transition to urban life when it was first time brought to the stage in Lataxil field in Guwahati by the Guwahati Bihu Sanmilani in 1962, promoted by leading citizens like Radha Govinda Baruah and others. Bihu to a great extent has been popularized by the Bihu 'Samrat'( king ), of Assam, Khagen Mahanta. Unlike the rural version, the dancers danced on a makeshift elevated stage in an open area that came to be known as a Bihutoli. Many such Bihutolis have sprouted since then in Guwahati and other urban areas. The performances are not confined to the bihu dance form, but may incorporate all forms of theatrical performances to keep the audience enthralled well into the early hours. Performances could include standup comedy, to concerts by solo singers. The stage form of bihu has become so popular, that organizers have begun extending the celebrations tobohagi bidai, or farewell to the Bohag month, which are similar performances held a month later.
- Xaat Bihu
- Rongali Bihu also called Xaat Bihu (seven Bihus). It celebrates seven days, it's called so. On the other hand, Rangali Bihu is constitute of seven different types of Bihu - Chot Bihu,Raati Bihu, Manuh Bihu, Kutum Bihu, Mela Bihu and Chera Bihu.