 The quick fluctuations in the speed of the music were another factor in the symphonic poem's complexity.The constant use of chamber-music textures, which are produced by having single players perform extended solo passages or having small groups play ensemble passages, put a stress on the orchestra; the mistakes of the solo artist or small groups would not be "covered up" by the mass sound of the orchestra and were obvious to everyone.These aspects of the symphonic poem demanded players to have superior caliber, perfect intonation, keen ears and knowledge of the roles of their orchestra members.