The 'Cocktail Trio' was a Dutch vocal trio active in the 50's-70's. Popular songs of them include 'Het Vlooiencircus', 'Op een Kangeroe-eiland', Batje Vier (Leve de man die het bier uitvond) and 'Wie heeft de sleutel van de jukebox gezien?'. The founder and leader of the group was Ad van de Gein('s-Hertogenbosch, 18th of may 1922). He also wrote songs for Willeke Alberti ('Morgen ben ik de bruid') and Ria Valk('de Vrijgezellenflat') that became hits in the Netherlands.

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