Pauline Viardot (1821-1910) was a Mezzo-Soprano of international acclaim and a respected vocal pedagogue of the nineteenth century, but also a composer of some renown. As a result of Viardot's extensive travels, she developed an interest in a variety of different European musical styles. This thesis is a detailed study of selected solo vocal works to help ascertain defining characteristics of Viardot's compositional style with particular emphasis on her use of Spanish styles and techniques which until now have remained unresearched. The findings will reflect the composer's interest and interpretation of cultural musical elements that are stylistically foreign to French listeners. Also referred to will be Viardot's stay in Spain during 1842. Until now, details of this tour have remained incomplete.