In the week of November 22nd to 25th, 2021, teachers from partner countries in the Erasmus+ project - “C.R.I.O.D. - Common Roots in our Diversity”, met, in a mobility, to Greece, in the scope of the project.During this week, the activity theme was: “Music without borders”. It was a mixed activity (Blended activity), consisting of live and online dynamics, in which students from partner schools rehearsed and presented two songs, one from their country and one from one of the partner countries. Students and teachers from all schools involved watched the various presentations online. In addition, the mobility teachers to Greece, visited landmarks of Greek culture and tradition: Athens, museum and the Acropolis (UNESCO world heritage site); Ancient Olympia (birthplace of the Olympic Games); visit to the city center of Patras and visit to the Achaia Clauss winery. The activities of the aforementioned project, which started in the 2019/2020 school year, had to be postponed due to contingency measures for the COVID 19 pandemic.This mobility, initially planned to take place with students, was not possible due to the pandemic risk that still exists. However, the project was extended for another academic year (2021/2022), with three mobilities being planned for the partner countries (Spain, England and Italy). The mobility to Portugal also didn’t occurred because of the same reasons. Nevertheless, there will be online activities to share the works done by the several students of each partner country, about the natural resources.