He starts his musical education in the society l’Edelweiss d’Orsières, and then he continues his formation at the Conservatoire de Sion where he obtains amateur degrees for trumpet and musical theory.

As instrumentalist he plays in different formations, for instance in the orchestra of Saint-Maurice or the Ensemble de Cuivres Valaisans.

Eloi Fellay starts his formation as musical director in the Swiss Army under the guidance of Rolf Schumacher and Christoph Walter. In 2007 he obtains the superior certificate for direction of the Swiss Windband Association.
He continues his formation in the domain of direction with Jean-Claude Kolly and obtains in 2012 a diploma in musical direction at the Conservatoire de Fribourg.

Eloi Fellay conducts since 2007 the Lyre de Grandcour, since 2008 the Army Band of the Territorial Region 1 and since spring 2011 the Ensemble d’Harmonie de la Broye.

Besides his musical activities he is Master Student in political economics at the University of Fribourg.