Flags fall and rise in wind, so I added that effect. Wave increases with distance from pole. Ukrainian anthem, translated poetically: "Nay, thou art not dead, Ukraine, see, thy glory's born again, And the skies, O brethren, upon us smile once more! As in Springtime melts the snow, so shall melt away the foe, And we shall be masters in our own home."
I added the falling and rising to my earlier model. I experimented until it looked right, and waved much less near the pole (amplitude and frequency decreases as x decreases). Ukrainian national anthem, MIDI (public domain, from Wikimedia), then, Ukrainian folk song by Mykola Lysenko, 1899 (Creative Commons, Wikimedia Commons Audio) See wikipedia: Shche_ne_vmerla_Ukrainy_i_slava,_i_volia
