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 Lord Byron, and written twelve years before Liszt treated the same subject orchestrally. The musicologist Mark Bonds suggests that in the second quarter of the 19th century, the future of the symphonic genre seemed uncertain. While many composers continued to write symphonies during the 1820s and 30s, "there was a growing sense that these works were aesthetically far inferior to Beethoven's... The real question was not so much whether symphonies could still be written, but whether the genre could continue to flourish and grow". Felix Mendelssohn, Robert Schumann and Niels Gade achieved successes with their symphonies, putting at least a