On Tuesday, April 12th, it will have been 50 years from what was arguably the most impressive achievement of the Soviet Union.
Czechoslovakia was the first country after the USSR that Gagarin visited after he returned (the picture here is from that visit) - and my positive emotions about his famous journey have survived from the times when I was a red kid even though I have never understood what was exactly the spectacular qualitative difference between flights in the airplane and the low-orbit cosmic flights. But today I admit that "g=0" for a long time is pretty new. ;-)
As TRF has already mentioned, the communist regime in Czechoslovakia celebrated Gagarin's achievement by a hit song composed within a characteristic genre of socialism and the Soviet bloc called jazz. This time, I offer you a children's TV version of the hit song; it features lots of other Soviet symbols such as the white stars from the U.S. flag and hockey sticks from a game invented by the Soviet Union. ;-)
A translation may be found below the video.