Bollywood dance is the dance-form used in the Indian films. It is a mixture of numerous styles. These styles include belly-dancing, kathak, Indian folk, Western popular, and "modern", jazz, and even Western erotic dancing.
Bollywood dancing is a form of dance that involves a lot of body movement, almost every part of your body is used from head to toe in every step. Bollywood dancing is different from other forms of dance because it can be used on both fast and slow paced songs also bollywood music often goes from being very fast paced to very slow paced in less than a second which makes it hard adapt to the change of the tempo.
The purpose of Bollywood dance is to tell a story or send out a message. Bollywood dancing is mostly in Bollywood movies because the dance adapts to the story line. For example if a girl falls in love with a boy, the dance will be about a girl chasing around a boy, while she is dancing.
At First, the dance was strictly only indian classical/folk dances (usually performed by one person).. The style of dancing in earlier Bollywood films was based on Indian Classical Dance or Folk Dances from various parts of India. These dances included the classical art forms of Kathak and Bharata Natyam.
In the late 50's & 60's group dances began to evolve in Bollywood films & choreographers started managing larger groups of dancers, with influences from folk dances. Then came the 70s and bollywood dancing changed quite a bit. It became more mainstream and was used in many movies. Then, it was replaced by Disco, which was a worldwide phenomenon at the time.
After experimenting with Classical, Semi Classical, Folk, Cabaret & Disco styles of dance, came an era which introduced Bollywood Free Style of dancing which was well represented by dancers who developed their own signature style of dance.
Bollywood songs, more formally known as Hindi film songs or filmi songs, are songs featured in Bollywood films. Derived from the song-and-dance routine in Western film circles, Bollywood songs, along with dance, are a characteristic motif of Hindi cinema which gives it enduring popular appeal, cultural value and context. Hindi film songs form a predominant component of Indian pop music, and derive their inspiration from both classical and modern sources. Hindi film songs are now firmly embedded in North India's popular culture and routinely encountered in North India in marketplaces, shops, during bus and train journeys and numerous other situations. Though Hindi films routinely contain many songs and some dance routines, they are not musicals in the Western theatrical sense; the music-song-dance aspect is an integral feature of the genre akin to plot, dialogue and other parameters.
The various use of languages in Bollywood songs can be complex. Most use variations of Hindi and Urdu, with some songs also including other languages such as Persian, and it is not uncommon to hear the use of English words in songs from modern Hindi movies. Besides Hindi, several other Indian languages have also been used including Braj, Avadhi, Bhojpuri, Punjabi, Bengali and Rajasthani.
In a film, music, both in itself and accompanied with dance, has been used for many purposes including "heightening a situation, accentuating a mood, commenting on theme and action, providing relief and serving as interior monologue.