Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/16
Q:1/4=60
M:9/8
K:Fmix
['F2 G3 A B2', 'g2 f3 g']  
X:1
L:1/16
Q:1/4=60
M:9/8
K:Fmix
 F2 | G3 A B2 B3 c B2 B4 F2 | G3 A B2 B2 c2 d2 e4 B2 |{A} G3 F E2 E3 F E2 G2A2 B2 | 
 c2 c2 B2 A3 G A2 F4 || g2 | f3 g e2 d3 e c2 B2 g2 | f3 g e3 d B3 d e4 (B_A) | 
 G3 F E2 E3 F E2 G A3 B2 | c2 d2 c2 B3 A G2 F4 |]  