echo + seashell are artists Henna Hyvarinen (Finland) and Susan Kooi (Netherlands). Their collaboration consists out of live music performances, videos and exhibitions. Critics have varied from 'East London meets Scandinavia?' to the duo using the word 'baby' too much. The music is often produced in collaboration with different musicians, resulting in variations in both style and genre. The lyrics and way of speaking form the core, the 'baby soul' of echo + seashell.

echo + seashell have performed amongst others at Paradiso, de Appel Arts Centre, de Ateliers, OT301 and for Girls Like Us at Butchers Tears in Amsterdam, 1646 in the Hague, showroom MAMA and Worm in Rotterdam, Flutgraben in Berlin, Sorbus and Bombshelter in Helsinki, UP STATE in Zurich, the Others in Turin, the Antagon Festival and Tehdas Theater in Turku, Fokidos in Athens, the Legion in Calgary, the Banff Centre in Banff and Selectors in Vancouver.

Kooi and Hyvarinen made a musical during an artist in residency at Hotel Maria Kapel in Hoorn, and have been performing and giving artist talks about performance art at the University of British Columbia (UBC) and Lethbridge University in Canada and at the Studium Generale at KABK in the Hague in the Netherlands. In 2016 Perro Verlag published 'Nature', a collection of echo+seashell songtexts in a printed format.