Advertising Poster Blues Music Hippy Psychedelic. Original vintage advertising poster Blues featuring a colourful floral and polka dot pattern illustration of a musician playing guitar and stylised lettering set over white background. Published by Minerva Poster, Copenhagen, Denmark. Good condition, creasing, tears, minor staining. Country of issue: Denmark, designer: Ib. K. Olsen, size (cm): 91x62, year of printing: 1968.