 Tchaikovsky also was of great influence, followed by Rimsky-Korsakov, Richard Strauss and Wagner.The greatest influence on use of the harp has always been the availability of fine harps and skilled players, and the great increase of them in the US of the 20th century resulted in its spread into popular music.The first harpist known to play jazz was Casper Reardon, a pioneer in the world of "hot" music.