Electromagnetic ballasts can produce an audible humming or buzzing noise. Other sounds produced include purring, puffing, bleating and humming. Sounds such as gurgling or humming are made by bears resting or sucking their paws. Sometimes he would start humming some tunes. He first developed "Cheerleader" in 2008, when he woke up humming its melody. Women chant lullabies, humming songs, and songs praising their sons. Displaying males croak and produce a strange deep humming. Murphy's first interest in music was due to his mother's habit of constantly humming tunes. It was described by some as "individual" and "humming tune". She had a habit of humming songs to herself while painting. The resulting sound varies in pitch and loudness with the player's humming. She is humming a song and being very friendly. The lights in IT are on bright and all the servers are humming. Regular diaphragmatic breathing may be achieved by extending the outbreath by counting or humming. As a singer, Winbush is well noted by her gospel-influenced musical humming during her songs.