Before start the World Record Guinness about the biggest dance ''omal'' worldwide, the singers Mathaios and Konstantinos Tsachouridis had a concert in TIF HELEXPO and in the part of the concert performs the Russian song ''Kalinka'' to thanks Russian peoples for the good relations about Greece-Russia, and because at the Thessaloniki International Fair was many Russian companies. The concert was at Thessaloniki.Mathaios Tsachouridis performs the song ''Kalinka'' from a musical traditional instrument the ''lyre'' that the history of this instrument was from the Pontos. They have play the soundtrack of Game of thrones, the song eye of the tiger and many many others.At the past Charles Prince of Wales had hear the music of these brothers and Prince give them award. These singer brother from Greece had study at London and the last years come to be very famous in Greece and all over the Europe cause the style of the music. Konstantinos Tsachouridis is opera singer.