sandglass: timepiece in which the passage of time is indicated by the flow of sand from one transparent container to another through a narrow passage
timepiece: a measuring instrument or device for keeping time
doo-wop: a genre (usually a cappella) of Black vocal-harmony music of the 1950s that evolved in New York City from gospel singing; characterized by close four-part harmonies; the name derived from some of the nonsense syllables sung by the backup