Smile were a London-based blues rock band best known as the predecessor to renowned rock band Queen. The band was formed in 1968 by Brian May, who was to become Queen's guitarist. The group included Tim Staffell as singer and bassist, and, later, drummer Roger Taylor, who also went on to play for Queen. The group disbanded in 1970.

In 1968, guitarist Brian May, a student at London's Imperial College, and bassist Tim Staffell formed a group when May placed an advertisement on the college notice board for a "Ginger Baker type" drummer, and a young medical student named Roger Taylor auditioned and got the job. Smile were signed to Mercury Records in 1969, and had their first experience of a recording studio in Trident Studios that year. Staffell was attending Ealing Art College with Farrokh ("Freddie") Bulsara, and introduced him to the band. Bulsara soon became a keen fan.

The group's biggest public performance was on February 27, 1969 at the National Council for the Unmarried Mother and Her Child. Held at the Royal Albert Hall, May, Taylor and Staffell performed as a trio on guitar, drums and bass respectively. Keyboardist Chris Smith had been fired the day before, according to Staffell. (According to Smith, he was only briefly in the band and left of his own accord because he was interested in different styles.)

A smile is a facial expression formed by flexing the muscles near both ends of the mouth. The smile can also be found around the eyes (see 'Duchenne Smiling' below). Among humans, it is an expression denoting pleasure, joy, happiness, or amusement, but can also be an involuntary expression of anxiety, in which case it is known as a grimace. Smiling is something that is understood by everyone despite culture, race, or religion; it is internationally known. Cross-cultural studies have shown that smiling is a means of communicating emotions throughout the world. But there are large differences between different cultures. A smile can also be spontaneous or artificial.

Many biologists think the smile originated as a sign of fear. Primalogist Signe Preuschoft traces the smile back over 30 million years of evolution to a "fear grin" stemming from monkeys and apes who often used barely clenched teeth to portray to predators that they were harmless. Biologists believe the smile has evolved differently among species and especially among humans.

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