What is the theme of book born to rock?

The theme of the book "Born to Rock" by Richard Adams (assuming this is the book you're referring to, as there isn't a widely known book with that exact title by another author) centers around the importance of family and overcoming adversity through the power of music. While the specifics depend on the plot details (which aren't widely available in summary form online), the theme generally revolves around a family who uses their musical talent to navigate difficult circumstances and strengthen their bonds.