We have just been to a performance of music and words based on the life of Clara Schumann.   It had been written by Gawn Grainger based on the various lives of Robert and Clara Schumann, particularly Clara, a novel by Janice Galloway.   The role of Clara was taken by Zoë Wanamaker, the singing by the great tenor, Keith Lewis, accompanied by Melvyn Tan.   Nothing could have been more intense than the lives of the two Schumanns played out in their own music and the music of Brahms.