In 1833 Paganini's appreciation of the viola was the cause of his asking Berlioz to compose a solo for it, "Les Derniers Instants de Marie Stuart" being selected as a fitting theme (!) for the display of the virtuoso's extraordinary powers. Berlioz, happily, was soon afterwards inspired with a worthier subject-the symphony "Harold in Italy," which contains a fine solo part for the viola. Paganini, however, as was anticipated by Berlioz, neither approved of the part, nor would he play it; consequently, at the first performance of the symphony in Paris in 1834, it was played by C. Urhan, and by Henry Hill (uncle of the writers) on the corresponding occasion in London in 1848.
Antonio Stradivarius: His Life & Work, W. Henry, Arthur F. & Alfred E. Hill, W. Henry, Arthur F. & Alfred E. Hill, Antonio Stradivari: His Life & Work (1644-1737), London