Ollie is a typically nervous but fun-loving 6-year-old boy who lives above his Mum’s musical instrument shop. Each bedtime, Ollie’s mum will alleviate his concerns or worries with a lullaby and he drifts off to Harmony Hill, a magical, musical land inhabited by 7 little note characters called the Octaves; Doh, Ray, Mi, Fa, So, La and Ti.