This kind of music was very popular in Sweden during the 70's. It was not band like Mecki or Råg i Ryggen or November, Träd Gräs och Stenar that was selling big amounts of records and earned a lot of money. It was the bands with political music and a left oriented political thougts that did it. Bands like National Teatern, Blå Tåget, Knutna Nävar was very popular in Sweden.
Röda Kapellet was formed in 1972 in the city Gothenburg and the members was also members in the communist party(VPK) and there youth section (KU). And on their first record you can read that it is " our mission to spread the thoughts from the party". This album is the first one they did their second is named "Party Musik-Parti Musik". And are really good it includes the 22 min track "Lärling". Something intresting is also that the band was split in one electric part and one acoustic part.
Ok now you maybe think "Why he is giving us these communist shit?". Well I think that you think to see a another part of Sweden not all the hyped band that I have mention in the text. And this is really good music. You don't have to be political intrested to like this kind of music.
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Best wishes from Sweden