The singers and players of instruments are from Kainchi. Celebrating Holi at MahaSamadhi Mandir at Maharajji's ashram on Parikrama Marg. This temple was built on the spot where Maharajji's last know body was burned. This 51 second video are singing "Sri Ram, Jai Ram". It is a valuable insight on Hindu practice at Maharajji's temples.
Holi (Hindi: होली) or Phagwah (Bhojpuri), is an annual and popular Hindu spring festival. It takes place over two days in the later part of February or early March. As per the Hindu calendar, it falls on the Phalgun Purnima (or Pooranmashi, Full Moon). It is also called the Festival of Colours.On the first day, a bonfire is lit at night to signify burning Holika. On the second day, known as Dhulandi, people go around until afternoon throwing colored powder and water at each other. A special drink is prepared called 'thandai' which can be laced with bhang, which actually contains small amounts of marijuana (Cannabis sativa). People invite each other to their houses for feasts and celebrations later in the evening. Rangapanchami occurs a few days later on a Panchami (fifth day of the full moon), marking the end of festivities involving colours.
Video: Jai Ram S.
Some of the text is from Wikipedia