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Alfonso is an established freelance musical director and musical supervisor in the West End who is regularly invited by major orchestras in the UK and abroad. 

As a freelance professional his work includes musical direction of music for film, television and games, musical theatre, symphonic, musical production... as well as composing for games, advertising and film.

Regular collaborations with BBCCO, Bournemouth Symphony, RLPO, Seville Royal Symphony Orchestra, OBC, London Concert Orchestra... etc

He is currently the Musical Supervisor for many Cameron Mackintosh's shows around the world as well as a teacher at the Royal Academy of Music in London.


“In many ways, this ‘no frills’ presentation achieved ‘the best of all possible worlds’. First, it featured the Bournemouth Symphony Orchestra, under the baton of Alfonso Casado Trigo, which meant that the score was handed colours, textures and a richness that are not heard when it is executed by smaller forces. Most striking of all was the sheer musicality of the playing, so that in the Overture the languid, lyrical lines rubbed shoulders seamlessly with the tauter, tumbling rhythms. The precision was obvious, but it was used as a starting point to capture the true spirit of the piece so that the Entr’acte carried just enough of a ‘dirty’ edge.”


Sam Smith, musicOMH – 
“Candide” Grange Festival, julio de 2018


He started conducting professional shows at the age of 20 in Madrid, and since then he has conducted and supervised shows in Spain, UK, Japan, United Emirates, Germany, China, Brazil… etc.

Major credits in musical theatre include Les Misérables (MD/Supervisor, Spain, Brazil, Tokyo, London and Dubai), Miss Saigon (MD/Supervisor London and Tokyo), Phantom of the Opera (MD/ Supervisor London and UK Tour), Mamma Mia! (Spain MD – International Asst. Supervisor)

He conducted the 25thanniversary Gala of Miss Saigon (released in DVD worldwide) and was co-supervisor for Les Misérables 30th in London.

Amongst his recent projects as freelance conductor, Alfonso has appeared in “Disney in Concert”, “Candide” (The Grange Festival), “Simply Gershwin” (Royal Festival Hall), “Pedralbes Festival” in Barcelona and was the conductor for the award winning score film “Buñuel and the labyrinth of the turtles” recorded at Abbey Road Studios in London.

He recorded a Spanish classical music album with the BBCCO in January 2018 alongside soloists Juan Pérez and Magdalena Llamas and he conducted this orchestra again in August 2018 for “Friday night is music night”.

Awards include Best Musical director in Spain for Los Miserablesand Best Musical director in the West End for Miss Saigon.

Future Projects include Royal Northern Symphony, Halle Orchestra, RLPO, OBC, Sessions for films etc.

His first score for a feature film will be released in 2021 for "Venus" by Víctor Conde. (






Musical productions in which Alfonso has participated