The Northern Pines Harmony Brigade had such a good time hosting its Extreme Quartetting weekend here at the Crowne Plaza Minneapolis West that the group decided to come back.  Participants are partnered randomly with three other singers, then given 10 songs to perform in a competition. Registration includes two nights at the hotel, five meals and the music you’ll use during the competition along with professionally prepared learning tracks. Or come to the public performance showcase on Saturday night. 763.559.6600.