Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/4
M:3/4
K:D
['(F2 A) (A2', '(f2 a) (e2 f)']  
X:1
L:1/4
M:3/4
K:D
 uA | (F2 A) | (A2 B) | (d2 e) | (d2 A) | (F2 A) | (A2 f) | (e2 d) | (B2 A) | (F2 A) | (A2 B) | 
 (d2 e) | (d2 A) | (F2 A) | (A2 f) | (e2 d) | d2 |] ug | (f2 a) | (e2 f) | (d2 e) | (f2 d) | 
 (f2 a) | (e2 f) | g/f/e/f/e/d/ | B2 g | (f2 a) | (e2 f) | (d2 e) | (f2 g) | (a2 A) | (A2 f) | 
"_D.C. to Allegro." (e2 d) | d2 |]  