Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:6/8
K:A
['A3 A3', 'aec efg{ag}']  
X:1
L:1/8
M:6/8
K:A
 A3 A3 | (BFB) (Bcd) | A3 A3 | f(^df) e(ce) | A3 A3 | BFB Bcd | ece (dcB) | A3 A3 :: efg{ag} a2 f | 
 g2 B (Bcd) | e3 aec | efg{ag} aec | efg{ag} (agf) | a2 B Bcd | ece (dcB) | A3 A3 :|  