Design a musical work that abides by the outlined structure and integrates the assigned theme.
X:1
L:1/8
M:4/4
K:D
['FAAA GAAA', 'DFFF AFFF'  
X:1
L:1/8
M:4/4
K:D
 FAAA GAAA | FAAA GFED | FAAA GAAA | FADE FEDE | FAAA GAAA | FAAA GFED | DFFF DFEF | DAGA D4 || 
 DFFF AFFF | DFFF GFEC | DFFF AFFF | DADF AFEF | DFFF AFFF | DFFF GFEC | DFFF DFEF | DAGA D4 ||  