Sreburnite Grivni (The Siver Bracelets) were a popular Bulgarian Beat group. Here they cover Na-Na-Hey-Hey, the 1970 hit song by the German prog-rockers Jeronimo, in Bulgarian. The other song is a instumental. It´s probably common knowledge, but I don´t know the song.
Interestingly on the B-side there are two songs by the Beatles, Come Together and Something, most probably bootlegged by the state-owned Bulgarian label Balkanton.
Actually I should have posted some better Bulgarian tracks by Sreburnite Grivni or Shturzite (the Crickets), or even the whole The Best Beat Bands from Sofia LP Compilation, because I have that one. But this is my little East-European summer week so maybe some other time. A while back I posted a nice Bulgarian Rock´n´Roll instrumental by Studio 5 here.
Meanwhile enjoy the summer in Sofia…