Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['ADD BAF', 'd2 e']  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:D] .abc B | ADD BAF | ABd edB | ADD BAF | AFE E2 F | ADD BAF | ABd efB | AdB AFA | 
 Bdd d2 :: B | AFA d2 e | fdf ecA | BAB d2 e | faf gfg | AFA d2 e | fdf ecA | AdB AFA | Bdd d2 :|  