In Pajottenland we have a tradition ( 500 years) of brewing Spontaneous fermented Lambic.
Geuze , there is only 1 ,is a wonderfull beer of spontaneous refermentation in a very strong bottle. Geuze is a blend of lambic of different years fermented in barrels of 1000 liter in wood.
Lambik , mother of all beers , spontaneous fermentation , brewed in coldest winterdays, for one night in open coolship when Brettanomyces will take control over 99 micro organisms.
Kriek , is only produced by adding the sour stone fruit with stones to the lambic , fermentation together for another 10 months.