Final answer:
Benjamin Britten composed 'The Young Person's Guide to the Orchestra' to introduce children to the different instrument families of the orchestra, such as wind, woodwind, brass, string, and percussion sections.
Step-by-step explanation:
The composer who wrote his piece as a way to introduce children to the instrument families of the orchestra is Benjamin Britten. Britten composed 'The Young Person's Guide to the Orchestra', also known as 'Variations and Fugue on a Theme of Purcell', which serves as an educational showpiece designed to familiarize children with the sounds of the various sections of the orchestra.
Through this engaging work, Britten helps to educate listeners on the distinct qualities of wind instruments, woodwind instruments, brass instruments, stringed instruments, and percussion instruments, each family being showcased in turn.