Bola de Nieve - Chivo Que Rompe Tambo (1960)

(Sonotone SLP8).

Ignacio Jacinto Villa Fernandez (1911-1971), received his surname Bola de Nieve (Snowball) by cuban singer Rita Montaner. He's a really atypical singer and pianist in cuban musical scene, active from the 30s, then famous internationally, to the 60s he spent back in Cuba. 

Eliseo Herrera, Trabalengua and the folkloric group Los Malibus (Colombia, 1960s)

(Fuentes Delujo LP 400168).

Eliseo Herrera (1924) played with various formations including one of the greatest at Fuentes: Los Corraleros de Majagual. He imposed his specific way of singing which became a style called "Trabalengua" (tongue-twisting). You'll recognize directly listening to following tracks, but basically it consists of producing a dense jerky flow, very fast, adding syllables, without any pause for breathing.