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They play music all the time.

Panche Baaja "Five Musical Instruments" is a set of five traditional Nepali musical instruments that are played during holy ceremonies like marriages. Panche baajas are usually played by the Damai; these are Dalit (untouchable) castes in Hindu tradition.

The panche baja includes the jhyali (cybals), tyamko (small kettledrum) or dholak (drums), damaha (large kettle drum), narsiha (a long S-shaped trumpet), shehnai (a folk oboe), and karnal (a wide-mouthed, straight trumpet with a bell that resembles the datura flower.).
Other rendering give the ensemble as: shehnai, jhyali, dholki, tyamko, and damaha.

Source: wiki

A Woman Carrying Grass
Photo By: Dexter Cruez

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Drums in Hari Kul's music store in Patan.

Nepalese Mask (Kathmandu, Nepal)
Photo By: EpiVin

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Madal (Nepalese Drum, Nepali: मादल) is traditional musical instrument of Nepal. Madal is the most important instrument in Nepalese folk songs. It contains hollow and cylindrical wooden body called Ghar (Nepali:घार ). The opening of the wooden cylinder is covered by starched leather (leather strings are woven in such a way that, the skin on the two ends get stretched ). The leather is made up of goat or ox skin. The stretched leather produces sound when beaten, and the inner hollow part helps to give reverberation to the beat. Right side is smaller and the left is bigger, hence left side gives bass sound. Fingers and palms of both hands are used to bit the drum to produce sound.

The woven leather strings stretches the skins of the two ends; the strings are called Taan (Nepali: तान). Taan contains metal rings to tune it Some part of the streched circular skin is covered by black material called Khari (Nepali: खरी). Khari used to make traditionally by applying a paste of straw ashes and cooked rice. The uncolored region between Khari and outer circumference is called Maidan (Nepali: मैदान). The leather string used to hang Madal is called Juina (Nepali: जुईना)

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Kumari being carried off the chariot after completing the procession during Indra Jatra.

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As a goddess, Kumari demands and deserves the most lavish in clothing and jewelry. Her clothes must be red, even for daily wear. For ceremonial occasions some Kumaris wear dresses of red brocade. The special makeup consists of heavily lined eyes and a large area of red on her forehead bordered by a solid yellow line. In the centre is placed the third eye. Her head is decorated with a crown which can be different in style and made of different materials. Kumari also wears square silver jantar, amulet box.
On the photos – 3 years old Kumari of Sankhu, a small town in 17 km from Kathmandu