Bollywood songs, more formally known as Hindi film songs, or filmi songs are songs featured in Bollywood films. Derived in Western film circles for the song-and-dance routine, 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 derives its 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.
Hindi film songs are present in Hindi cinema right from the first sound film Alam Ara (1931) by Ardeshir Irani which featured seven songs. This was closely followed by Shirheen Farhad (1931) by Jamshedji Framji Madan, also by Madan, which had as many as 42 song sequences strung together in the manner of an opera, and later by Indra Sabha which had as many as 69 song sequences. However, the practice subsided and subsequent films usually featured between six and ten songs in each production.
Right from the advent of Indian cinema in 1931, musicals with song numbers have been a regular feature in Indian cinema. In 1934 Hindi film songs began to be recorded on gramophones and later, played on radio channels, giving rise to a new form of mass entertainment in India which was responsive to popular demand. Within the first few years itself, Hindi cinema had produced a variety of films which easily categorised into genres such as "historicals", "mythologicals", "devotional, "fantasy" etc. but each having songs embedded in them such that it is incorrect to classify them as "musicals".
The Hindi song was such an integral features of Hindi mainstream cinema, besides other characteristics, that post-independence alternative cinema, of which the films of Satyajit Ray are an example, discarded the song and dance motif in its effort to stand apart from mainstream cinema.
The Hindi film song now began to make its presence felt as a predominating characteristic in the culture of the nation and began to assume roles beyond the limited purview of cinema. In multi-cultural India, as per film historian Partha Chatterjee, "the Hindi film song cut through all the language barriers in India, to engage in lively communication with the nation where more than twenty languages are spoken and ... scores of dialects exist". Bollywood music has drawn its inspiration from numerous traditional sources such as Ramleela, nautanki, tamasha and Parsi theatre, as well as from the West, Pakistan, and other Indic musical subcultures.