In 1947, Naohiro Iwai graduated from the Tokyo Ongaku School's Instrumental Department (today this is part of the Tokyo Geijyutu University). Following his graduation, he entered the Jazz field, gaining experience by working as an arranger with many bands, including the Anny Pile Orchestra and Franky Sakai's "City Slicker" Band.
He has arranged over 5,000 songs in the classical and popular styles for many different purposes, including brass and woodwind ensembles, and music education. He is very active nationwide as a conductor and adjudicator, and is famous for his band clinics. As a composer, arranger and conductor it is his aim to develop pop music for brass and concert bands.
