Чајковски jе посветио ову музику борби Срба против Турака
http://www.youtube.com/watch?v=AxlytWahi7MIn June 1876, following incidents in which Turkish soldiers killed a large number of Christian Slavs who rebelled against Ottoman Empire and supported by countries like Austria and Russia, Serbia declared war on Turkey. Russians sent volunteers and aid to assist the Kingdom of Serbia...Tchaikovsky composed and orchestrated what was first known as the "Serbo-Russian March" (later to be known as "Marche Slave")
The first section describes the oppression of Serbs by Turks. It uses two Serbian folk songs. The first "Come my dearest, why so sad this morning?" is played at the outset, as Tchaikovsky directs, "at the speed of a funeral march". The second folk song is more optimistic in character. An episode follows, describing the atrocities in the Balkans, in which Tchaikovsky uses his mastery of the orchestra to build a tremendous climax, at the height of which the first folk song returns, fortissimo on the trumpets like a plangent cry for help.
The tempestuous mood subsides giving way to the second section in the relative major key, which describes the Russians rallying to help the Serbs. This is based on a simple melody with the character of a rustic dance which is passed around the orchestra until finally it gives way to a solemn statement of the Russian national anthem "God Save the Tsar".
The third section of the piece is a repeat of Tchaikovsky's furious orchestral climax, reiterating the Serbian cry for help. The final section describes the Russian volunteers marching to assist the Serbians. It uses a Russian tune, this time in the tonic major key and includes another blazing rendition of "God Save the Tsar" prophesying the triumph of the Slavonic people over tyranny. The overture finishes with a virtuoso coda for the full orchestra.
http://en.wikipedia.org/wiki/Marche_SlaveБило би добро наћи ову српску народну песму "Come my dearest, why so sad this morning?" (не знам тачан превод) и сравнити.