The music business is a strange, interesting and broad church. A spectrum of musical styles and personalities all fulfilling the needs of different markets. There are pop stars who are buoyant but ephemeral. Then there are singer/songwriters who take their work seriously as they express their critique of the human condition via their music. There are also style icons, novelty acts, indie bands, lounge crooners and a myriad of other niche acts, all doing their own thing. And occasionally there are enigmas. Artists and bands that fly in the face of prevailing trends and commercial interest, who do consider their work to be an artistic endeavour and an expression of themselves and as such, do not see the virtue of personal compromise or corporate interests. Esoteric musicians who reinvent themselves continuously as they grow and age. Constantly defying the expectations of both their own fans and naysayers. Sparks are such a musical entity and the subject of a fascinating documentary by director Edgar Wright.