Joan Castelló finished his musical studies at the Jesús Guridi Higher Conservatory in Vitoria, where he obtained an academic end-of-degree award. At the same time, he did a postgraduate degree at Neopercusión, a training centre that specialises in percussion in Madrid. He has done courses to perfect his technique and masterclasses with world-renowned professors such as L.H. Stevens, E. Sejournee, T. Adams, D. Samuels, and C. Lamb, in addition to a contemporary music perfection course with Juanjo Guillem and a Jazz and Orff Schulwerk course with Doug Goodkin at the University of Alcalá.
In 2002, he won the international Yamaha Music Foundation of Europe (YMFE) Competition in the Marimba speciality. He belonged to the Youth Orchestra of the Community of Madrid and the National Youth Orchestra of Spain (JONDE).
As an orchestral musician, he has collaborated with the Tenerife Symphony Orchestra, the Gran Canaria Philharmonic, the Madrid Symphony, the Community of Madrid Symphonic Orchestra, Radio Televisión Española, the Principality of Asturias Symphony Orchestra, and the National Orchestra of Spain and he has toured Spain, Germany, Vienna, Prague, England, Mexico, Finland, Slovenia, France, China, the United Arab Emirates, and the USA.
As a soloist, he has played at the most important festivals in Spain such as Escena Contemporánea (Contemporary Stage Festival), Quincena Musical (Musical Fortnight), the Alicante Festival, Otoño Soriano (Musical Autumn), and the International Percussion Conference in Paris. Likewise, he is a founding member of the Academy of Contemporary Music of Spain (CDMC) and of the Puebla Symphony Orchestra (Mexico) and has recorded for Radio Televisión Española and Radio Nacional de España.
He is currently part of the Neopercusión group, a professor at the Katarina Gurska Higher Music Centre, and a professor for the National Orchestra and Choir of Spain.