Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['D3 F A/A/A (AF) ABdA F2', '(BA) d3 f d/d/d (dB) ABdA F2']  
X:1
L:1/8
M:2/2
K:D
 D3 F A/A/A (AF) | ABdA F2 FD | E2 EF B/B/B (BA) | dfed B2 (B/c/d) | D3 F A/A/A (AF) | 
 ABdA F2 (FD) | (GFG)B FAdF | EDEF B2 (BA) || d3 f d/d/d (dB) | ABdA F2 (FD) | e3 f e/e/e (ef) | 
 gfed B/B/B (BA) | d3 f d/d/d (dB) | ABdA F2 FD | GBeG FAdF | EDEF B2 (B/c/d) |]  