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 poem could be regarded as equivalent to, or higher than opera. The symphonic poem remained a popular composition form from the 1840s until the 1920s, when composers began to abandon the genre. Some piano and chamber works, such as Arnold Schoenberg's string sextet "Verklärte Nacht", have similarities with symphonic poems in their overall intent and effect. However, the term symphonic poem is generally accepted to refer to orchestral works. A symphonic poem may stand on its own (as do those of Richard Strauss), or it can be part of a series combined into a symphonic suite or cycle. For example, "The