ECHO (European Cities of Historical Organs) was founded in 1997 upon a proposal made by Andrea Marcon, by the cities of Alkmaar (Netherlands), Innsbruck (Austria), Lisbon (Portugal), Roskilde (Denmark), Treviso (Italy), Toulouse (France) and Zaragoza (Spain). This union of cities both with historical organs and a festival or an international competition then decided to unite their efforts, share documentation on historical instruments, make common projects and exchanges, help students exchanges, and promote the construction of new instruments based on historical examples.

One of the latest projects of ECHO is ECHOM (ECHO Collection of Historical Organ Music). It concerns the conception and the realization of a series of organ music scores presented by the different cities, members of ECHO. The series of ten volumes (two per year between 2018 and 2022, general editor: Jean Ferrard) will involve unpublished or out of print complete manuscripts, and not excerpts. The musicological value of the collection depends on its detailed historical comments, complete critical reports and a demanding and responsible editorial policy, following the usual high standards of the organ publications of Ut Orpheus, Bologna.

The Consort Magazine (Summer 2020)

... These Tentos offer an interesting range of pieces, many providing technical challenges, but should prove rewarding to study and master; they offer excellent material for voluntaries and recitals. ... João Vaz and his colleagues are to be thanked for their work in providing a much-needed new edition of these important pieces. (John Collins)

EarlyMusicReview.com (November 2019)

... such an excellent volume. If I had access to an organ (or even a piano!), I think I might be tempted to sit down and play these pieces! (Brian Clark)