"...I can truly say that M.o Merletti is one of the most gifted musicians I have met in my 41 years' carreer.He's very talented, sensitive with the singers and deeply expert in the operatic repertoire, as well in the soloist's one, in wich he displays eccellent technics.."
Alessandro Corbelli, baritone.
"..I've met several times Sergio Merletti who assisted to many of my rehersals at the Teatro Regio di Torino. I've been keeping an eye on him and he is doing good job as a vocal coach and as a conductor as well. I think he has the right skills to work in any Opera house.."
Gianandrea Noseda, conductor.
"Sergio Merletti, pianista dotato di spontanea musicalità, ottima intesa con la solista e profonda conoscenza del repertorio melodrammatico, udibile da subito nell’esecuzione dell’Intermezzo da Cavalleria rusticana."
Francesco Bertini, Connessi all'Opera.