As a composer, he wrote a number of lighter orchestral pieces such as Lullaby for Penelope.
In 1976, Osborne worked for ATV Music and was responsible for trying to get the company's catalogue airtime on BBC radio programmes.
[1] In that role, he met composer Simon May, who had then recently had a pop hit with his song "Summer of My Life".
Osborne later introduced May to various other TV executives, and he was commissioned to write themes for Skorpion, Cold Warrior, EastEnders and Howards' Way.
Because of his executive role, Osborne was able to secure a writer credit for the themes for EastEnders and Howards' Way, despite, in reality, May being the sole composer.