From the Royal Albert Hall, London. The Prom concludes with Rainbow, by Thea Musgrave, who celebrates her 80th birthday this year. The work charts a musical journey from approaching storm, through the appearance of a rainbow to a sunny chorale of thanksgiving, and is followed by Debussy's La mer. Royal Scottish National Orchestra Stephane Deneve (conductor) Thea Musgrave: Rainbow Debussy: La mer.