"Alok" is a Sanskrit language word, it means "Light"

Aalok (Javanese

Javanese language

Javanese language is the language of the Javanese people from the central and eastern parts of the island of Java, in Indonesia. In addition, there are also some pockets of Javanese speakers in the northern coast of western Java...

 for "shout") is a style of singing used in Javanese gamelan

Gamelan

A gamelan is a musical ensemble from Indonesia, typically from the islands of Bali or Java, featuring a variety of instruments such as metallophones, xylophones, drums and gongs; bamboo flutes, bowed and plucked strings. Vocalists may also be included....

. It is generally performed by the gerong

Gerong

Gerong is the Javanese verb meaning "to sing in a chorus." Penggerong is the proper name of a member of the chorus, but often the word gerong is used to refer to the unison male chorus that sings with the gamelan. The chorus or the melody may also be called the gerongan.The gerong generally sings...

. It consists of short phrases (usually vowels) of indeterminate pitch, inserted especially at certain places in the colotomic structure of the piece.

Senggakan are similarly inserted into pieces, but generally consist of nonsense syllables and are sung in a specific melody. They are often used together with keplok

Keplok

Keplok is a style of clapping used in Javanese gamelan. The clapping is in a specific interlocking rhythmic pattern and is performed by the gerong when they are not singing. It is usually associated with the lively ciblon or batangan drumming...

.

Balinese kecak

Kecak

Kecak is a form of Balinese dance and music drama, originated in the 1930s Bali and is performed primarily by men, although a few women's kecak groups exist as of 2006....

similarly uses nonsense syllables.

Aalok means "Light" in Hindi. In India Aalok is believed to be the outcome of Sun's great Energy. "Aalok" is also an synonym for enlightlment.