July 21

Events

 * 1955 - makes his first investigation of the use of ultrasound in medical diagnosis to image tumors from human organs

Births

 * 1920 –, Ukrainian-born violinist (d. 2001)
 * 1922 –, American singer
 * 1938 –, Canadian pianist, composer and conductor
 * 1946 –, British musician (Herman's Hermits)
 * 1948 –, English singer/songwriter
 * 1955 –, American musician (d. 2003)
 * 1957 –, American songwriter and music producer
 * 1961 –, Punjabi folk singer
 * 1961 –, American musician (Faith No More)
 * 1969 –, American musician (Tonic)
 * 1978 –, Jamaican musician
 * 1981 –, American musician