Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:Dmix
['F3 G A2', 'cAAG fde^c d2 =cA A2 BG ABde'  
X:1
L:1/8
M:4/4
K:Dmix
 F3 G A2 BG | A2 BG AGFD | F3 G A2 GF | DG G2 cAAG :| fde^c d2 =cA | A2 BG ABde | fd d2 edcA | 
 BG G2 AGFD :|  