Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/8
M:9/8
K:Gmin
['B2 G', 'AcA BAB cBc d3']  
X:1
L:1/8
M:9/8
K:Gmin
 B2 G ^F2 A D2 c | B2 G G2 B AcA | B2 G ^F2 A D3 | D2 F F2 B AcA :| BAB cBc d3 | _e2 c c2 F AcA | 
 BAB cBc d3 | c2 F F2 B AcA :|  