Half a year later Rauno Lehtinen followed with his song "Letkis". This has become by far the most popular of all songs in the letkajenkka genre. It was first recorded by his studio orchestra Rautalanka Oy in August 1963, but was made popular in the October of the same year by a group called Ronnie Krank's Orchestra. His chart topper has been re-recorded approximately a hundred times, and the rights to at least 60 versions of the song are owned by Swedish publisher Stig Anderson. One well known recording of the song is by German musician Roberto Delgado.