lalku = chant (noun) (some things Google found for "lalku": an uncommon to rare term; a place in the North-West Frontier Province of Pakistan, Kuz Lalku and Lalku valley also; user name; a masculine first name in India)
Word derivation for "chant" :
Basque = kantu, Finnish = laulu
Miresua = lalku
This was originally the word for song. It has been slightly modified to become the word for chant. The Basque and Finnish words do work for chant.
The new Miresua word for song, abelu, uses what appears to be the more common Basque word for song, abesti, instead of kantu.