Sikh music, also known as Gurbani Sangeet (Gurmukhi: ਗੁਰਬਾਣੀ ਸੰਗੀਤ; meaning music of the speech of wisdom), and as Gurmat Sangeet (Gurmukhi: ਗੁਰਮਤਿ ਸੰਗੀਤ; meaning music of the counsel or tenets of the Guru), or even as Shabad Kirtan (ਸ਼ਬਦ ਕੀਰਤਨ), is the classical music style that is practised within Sikhism. It exists in institutional, popular, and folk traditions, forms, and varieties. Three types of Sikh musicians are rababis, ragis, and dhadhis. Musical expression has held a very important place within the Sikh tradition ever since its beginning, with Guru Nanak and his faithful companion, Bhai Mardana. Mardana was a player of the rabab, and would travel alongside Nanak and play the instrument when Nanak spoke his teachings. As a result of this, Mardana is credited as establishing the rababi tradition in Sikhism. When Guru Nanak received a revelation, he would exclaim: "“Mardaneya! Rabab chhed, bani aayee hai" ['Mardana, play the rabab, bani (composition/verse) has occurred to me']. During the time of Guru Nanak, the predominant musical tradition of the era was the dhrupad and dhamar, which ended up influencing this early Sikh musical expression. Later, other musical traditions, such as khayal, tappa, and qawwali, began to influence the Sikhs. In a case of mythology interacting with history, various instruments' origin is credited to Sikh gurus. The taus and dilruba is ultimately of Iranic origins, with the taus designed into a unique peacock shape and introduced into Sikh music by Guru Hargobind and the later dilruba invented by Guru Gobind Singh. The saranda is traced back to Guru Amar Das and Guru Arjun. In recent times, the traditional raga based Sikh musical traditional (including singing the partal with a complex array of taals) has fallen out of favour and been replaced with "semi-classical, light, light, folk or even filmy" styles. However, efforts are being undertaken to revive traditional Sikh raga musical expression. Traditional Sikh instruments have been supplanted by the harmonium, violin, mandolin, and electronic keyboard, and are at risk of extinction.