Many Hawaiian songs feature falsetto. In Hawaiian-style falsetto - called "ka leo ki'eki'e" - the singer, usually male, emphasizes the break between registers. Sometimes the singer exaggerates the break through repetition, as a yodel. As with other aspects of Hawaiian music, falsetto developed from a combination of sources, including pre-European Hawaiian chanting, early Christian hymn singing and the songs and yodeling of immigrant cowboys, called "paniolos" in the Hawaiian language, during the Kamehameha Reign in the 1800s when cowboys were brought from Mexico to teach Hawaiians how to care for cattle.