The Leningrad Cowboys is a Finnish rock and roll band famous for its humorous songs and concerts featuring the Soviet Red Army Choir. The band was an invention of the Finnish film director Aki Kaurismäki, appearing as a fictional band in his 1989 film Leningrad Cowboys Go America. The fictional band, however, was made up of members of a real Finnish band, the Sleepy Sleepers, plus some additional people. After the film, the band took on a life of its own, recording music, making videos and giving concerts.
Currently, the band has eleven Cowboys and two Leningrad Ladies. The songs, all somewhat influenced by polka and progressive rock, and performed in English, have themes such as 'vodka', 'tractors', 'rockets', and 'Genghis Khan', as well as folkloric Russian songs, rock and roll ballads and covers from bands as diverse as The Beatles, Led Zeppelin, and Lynyrd Skynyrd, all with lots of humour.
Here, they perform "Sweet Home Alabama" with the Red Army Choir (Choir Aleksandrov) which is a performing ensemble that served as the official army choir of the former Soviet Union's Red Army.
copy from Wikipedia, because I was too lazy to parse and rephrase