Symphonic poem Tchaikovsky's work as "Isle of the Dead" (1909) does its independence from it. A similar debt to his teacher Rimsky-Korsakov imbues Igor Stravinsky's "The Song of the Nightingale", excerpted from his opera "The Nightingale". Alexander Scriabin's "The Poem of Ecstasy" (1905–08) and "" (1908–10), in their projection of an egocentric theosophic world unequalled in other symphonic poems, are notable for their detail and advanced harmonic idiom. Socialist realism in the Soviet Union allowed program music to survive longer there than in western Europe, as typified by Dmitri Shostakovich's symphonic poem "October" (1967). While France was less concerned than other countries
Symphonic poems (Liszt) music. Due to its use of unusual key signatures, the symphonic poem had many sharp and flat notes, more than a standard musical work. The greater number of notes posed a challenge to musicians, who have to vary the pitch of the notes in accordance with the score. 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