Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=100
M:6/8
K:D
['A F2']  
X:1
L:1/8
Q:1/4=100
M:6/8
K:D
 A | F2 A F2 D | D2 D D3 | F2 G E3 | E3 E3 | E2 F D3 | DB,C D2 A | F2 A FDD | D2 D DA,A, | 
 B,2 D B,2 D | (B, A,3) z A, | (A,3 D)zG, | F,2 A, D2 E | F2 G E2 F | D3 ||  