Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
Q:1/4=120
M:6/8
K:G
['D GAG FED (GA)G (FD)d B3- B2']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:G
 D | GAG FED | (GA)G (FD)d | B3- B2 D | GAG FED | (GA)G (FD)d | B3- B2 B | (de)d (dc)B | 
 cdc (cB)A | BBB dcB | AAA d2 d | B3 B2 A | G3 GAB | c2 B c2 F | G3- G2 ||  