In Baroque era Spain, there were a number of significant composers of solo instrumental music for organ and vihuela. Spanish composers were the first to compose theme and variations, which became a significant instrumental form elsewhere in Europe as the period progressed. Many Italian composers worked in Spain during this period, and Spanish composers often received training in Italy, so it is not surprising that a clear Italian influence can be heard in Spanish Baroque music. In vocal music, this can be seen not only in the melodic and formal elements, but also in the choice of instruments, particularly the use of paired high voices accompanied by paired high instruments.