For other uses, see Rehearsal (disambiguation) or Dress rehearsal (disambiguation)

A rehearsal is an event that occurs as preparation for a performance. It is undertaken as a form of practising, to ensure that all details of the subsequent performance are adequately prepared and coordinated. Most commonly employed in the performing arts as preparation for a public presentation, rehearsals are nevertheless used in other contexts, as well, to prepare for the performance of any anticipated activity.

In theatre, a performing arts ensemble rehearses a work in preparation for performance before an audience. Rehearsals that occur early in the production process are sometimes referred to as run-throughs. Typically a run-through does not contain many of the technical aspects of a performance, and is primarily used to assist performers in learning dialogue and to solidify aspects of blocking and stage movement.

A Q-2-Q or cue to cue is a type of technical rehearsal and is intended primarily for the lighting and sound technicians involved in a performance, although they are of great value to the entire ensemble. It is intended to allow the technicians and stage manager to rehearse the technical aspects of a performance—when lights have to be turned on, sound effects triggered, and items rolled on and off the stage—and identify and resolve glitches. Performers do not typically rehearse entire scenes during Q-2-Q's, but instead only perform dialogue or actions that are used by the stage manager as a marker for when to initiate technical sequences or cues (hence the title). Abbreviated Q-2-Q's in which only the opening and closing sequences of each act or scene are performed is sometimes referred to as tops and tails. It is rare for any but the most technically complex performances to have Q-2-Q rehearsals outside of technical week.

Sergey Vyacheslavovich Lazarev (Russian: Сергей Вячеславович Лазарев) (born 1 April 1983) is a singer, dancer and actor born in Moscow, Russia. He is most famous for his singing career, when he rose to fame as the dark-haired member of the group Smash!!. The group broke up in 2006. Since then Lazarev has pursued a solo career.

From the age six to nine Sergey Lazarev went in for artistic gymnastics. Lazarev began his acting and singing career before the age of 10, singing in the Lokteus Children Choir. At the age of 14, he had already received his first musical award, won several children's song contests, and ended up as a member of child group Neposedi (Непоседы), the same group in which Yulia Volkova and Lena Katina of t.A.T.u met each other. Also his friend Vlad Topalov (Влад Топалов) joined the group, who later would become the other half of the group Smash!!.

When he was eleven, he sang in the Pokrovsky Theatre, had parts in many plays. In 1995, at the age of 12, Sergey entered the fidgets band, the same year he won the TV contest of children's gold key. As a part of the fidgets group Sergey took part in famous Russian TV programs and contests, such as "Guess the Tune", "Grasp Me", "The Morning Star", "Look Out", "The Blue Light" and "The Slaconic Bazaar". In September 1996 Sergey won the first prize at the contest Bravo Bravissimo in Italy. The same year he sang with the president orchestra led by P. Ovsyannikov.