Oi Thalassies oi Hadres (Greek: Οι Θαλασσιές οι Χάντρες, The Blue Beads) is a 1967 Greek musical film, directed by Giannis Dalianidis and starring Zoe Laskari, Kostas Voutsas, Martha Karagianni, Faidon Georgitsis, Giannis Vogiatzis and Mary Chronopoulou.
Mary (Zoe Laskari) is a rich young lady that challenges problems in a traditional folk neighbourhood in Plaka, Athens, when she moves to play modern music in a store opposite a traditional taverna, where Fotis (Faidon Georgitsis), a bouzouki player, works along with Kostas (Kostas Voutsas), Sofia (Mary Chronopoulou) and others.
Eventually, Fotis falls in love with Mary, but his friends margin him as he seems willing to sacrifice everything for her in order to be accepted by her social circles.
The main subject of the film is the influx of foreign cultural elements in the Greek society in the 1960s, like the music genres of pop and rock.
In the film this influx shocks the traditional neighbourhood of Plaka in Athens, infuriates and alarms the people who occupy with the laïkó music style.