The American rock band Metallica has surprised fans in Moscow by performing a song in the Russian capital by the late Soviet-era rock star Viktor Tsoi. In the middle of the concert at Moscow's Luzhniki Sports Stadium on July 21, the group's bassist Robert Trujillo and lead guitarist Kirk Hammett suddenly started performing one of Tsoi's most popular songs -- Gruppa Krovi (Blood Type). They sang the song in the Russian language. The group's fans started singing the song together with Metallica. Tsoi and his group, Kino, were extremely popular in the Soviet Union during the late 1980s. His songs...