Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:3/8
K:A
['[Ae] ([Aa]gf) ([Ae]fg)']  
X:1
L:1/8
M:3/8
K:A
 [Ae] | ([Aa]gf) | ([Ae]fg) | ([Aa]e[Dc]) | !fermata![G,DA]2 [Ae] | ([Aa]gf) | ([Ae]fg) | 
 ([Aa]gb) | !fermata![Aa]2 [Ae] | ([Aa]gf) | ([Ae]fg) | ([Aa]e[Dc]) | [DA]2 [DB] | ([Dc]BA) | 
 [G,E]2 [G,D] | EAE | [G,D][G,D] | EAE | [G,D]2 [G,D] | !fermata![DA]2 [Dc] | ecB | ([B,D-A-]3 | 
 [G,DA]2) :|  