Adriano Sérgio – Ergon Guitars – Stringed instruments luthier, Lisboa, Portugal
http://www.ergonguitars.com/

Andy Manson – Stringed instruments luthier, Mortágua – Portugal
http://www.andymanson.co.uk/

Carlos Juan Acoustic Amplification – Acoustic instrument amplification, Stuttgart – Germany
http://carlosjuan.eu/

Catarina Torres – Double bass restauration, Lisbon – Portugal
http://catarinatorres.do.sapo.pt/main.html

Orlando Trindade – Stringed instruments luthier, Caldas da Rainha – Portugal
http://www.orlandotrindade.net/

Seth Baccus – Stringed instruments luthier, Mortágua – Portugal
http://www.andymanson.co.uk/seth_baccus_guitars/