In 1942, Maestro Nazario Carlo Bellandi obtained the Diploma in Composition at the Conservatory of St Cecilia in Rome. Two years later he obtained the Diploma in Piano at the same Conservatory. In 1946 he specialized in Choral Conducting and in Film Music Composition at the Roman Academy of St Cecilia. In 1947 he got the Diploma in Gregorian Chant at the Pontifical Institute of Sacred Music. In 1948 he obtained the Diploma in Organ and Organ Composition at the Conservatory of St Cecilia. In 1949 he was awarded the Magistrum in Organ at the Pontifical Institute of Sacred Music and the specialization in Organ at the Academy Chigiana of Siena, Italy. He also specialized in Musical Paleography at the University of Bologna, Italy. He also studied at the Conservatory of Palermo and the Conservatory of Parma. He studied with Renzo Silvestri (piano), Ferruccio Vignanelli and Fernando Germani (organ), and Alessandro Bustini (composition). He was a fellow student for several years of Carlo Maria Giulini, Bruno Maderna, Armando Renzi, and Guido Turchi.
From 1949 to 1989/90, Maestro Bellandi taught for 40 consecutive years. For the first 25 years he held the Chair of Professor of Organ and Organ Composition at the Conservatory of Santa Cecilia in Rome, Italy. Since 1974 he was Professor of Composition at the same Conservatory. He also held the chair of Professor of Main Organ, Harmony, and Counterpoint. He also held the Chair of Complementary Harmony and Counterpoint at the Conservatory of Naples and taught at the Institute St. Alessio in Rome. He received several other nominations for teaching: piano for the Conservatory of Turin, Gregorian Chant for the Conservatory of Bologna, Harmony and Counterpoint for the conservatory in Naples, 2nd place in the national ranking of qualified Professors for the teaching of the Harpsichord and Organ and Organ Composition for the conservatories in Cagliari and in Rome.
Among other concerts, he was a fine scholar and performer of music by J. S. Bach. He also performed the complete works for organ by Cesar Franck.