Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/16
Q:1/4=60
M:3/8
K:D
['(BA) (F2B2).B2 (B4 cd) (efedcB) (A2B2).c2 .d2(defg)', '(fg a2)f2']  
X:1
L:1/16
Q:1/4=60
M:3/8
K:D
"_vb" (BA) | (F2B2).B2 | (B4 cd) | (efedcB) | (A2B2).c2 | .d2(defg) | (a2f2)(ed) | (c2A2).A2 | 
 A4 (BA) | (F2B2).B2 | (B4 cd) | (efedcB) | (A2B2).c2 | .d2(defg) | (a2f2) (Tfe) | (d2B2).B2 | 
 B4 || (fg | a2)f2 (fg | a2)f2 f2 | (efedcB) | .A2(ABc) z | .d2(defg) | (a2f2)(fe) | (f2e2).e2 | 
 e4 (fg | a2)f2 (fg | a2)f2 f2 | (efedcB) | .A2(ABc) z | .d2(defg) | (a2f2)(Tfe) | (d2B2).B2 | 
 B4 |]  