Having played the piano from the age of 3, Daniel Capelletti became a student of the Brussels Royal Conservatoire of Music at 13. His main teachers were Eduardo del Pueyo (piano) and André Laporte (composition). He is a laureate of several international piano competitions both in Belgium and abroad (Italy, Spain), and three-time winner of the Sabam Prize for composition at the Queen Elisabeth Competition.

He performs in numerous concerts and recitals all over Europe (Belgium, France, Luxembourg, Italy, Spain, Germany, Hungary, Poland, etc.).

Selected works: Cariatides for violin and piano (1985); Aquarelles for symphonic orchestra (1986); Reeds for 28 single reed instruments, a piece premiered by the Musique des Guides in 1997; Sven, symphonic tale based on the novel of Pierre Coran (1998); Anamorphose for string quartet, premiered during the Ars Musica Festival 2001; Suite latino-américaine for violin, guitar, accordion, piano and double bass, commissioned by Soledad (2002); Ge(r)ms for alto sax and piano, set piece of the International Adolphe Sax Competition in Dinant 2006; Transience, a symphonic piece written in 2007, dedicated to the Tulse Luper Suitcase's story of Peter Greenaway. Viajes, a piece for tango quintet, percussion and strings (2010).

Daniel Capelletti has had multiple collaborations in all musical genres, both as a pianist and a composer and arranger: classical (Julia Migenes, José Van Dam, Philip Webb, Wilfried Van Den Brande), jazz (Philippe Catherine, Bruno Castellucci, Marta Mus), pop (Roger Hodgson, Philippe Lafontaine, Maurane, Annie Cordy, Alec Mansion), film music (Melissa Errico, Mary Carewe, Michael Dore, Rosemary Squires), etc.

He has taught the piano from 1980 at the music school of Zaventem. Since 1993 he teaches at the Brussels Royal Conservatory (1993-1997: musical analysis; since 1997: composition).