Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: She also composed romances, Sonatas and Quartets. The composer's works "Ey vətən" (sung by Rashid Behbudov) described Azerbaijan all over the world. She wrote music to the hundreds of poems of Azerbaijan poets and tens of poetic examples in Russian.

Question: What country did the composer's work describe?
Azerbaijan