Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:23/44
K:F
['', '[AF][BG] [cA][dB] [cA]2']  
X:1
L:1/8
M:23/44
K:F
"A" |:"F" [AF][BG] [cA][dB] [cA]2 | [AF][BG] [cA][dB] [cA]2 |"C7" [BG]2 [GE]2 |"F" [AF]2 [FC]2 | 
"F" [AF][BG] [cA][dB] [cA]2 | [AF][BG] [cA][dB] [cA]2 |"C7" [BG]2 [GE]2 |"F" [FF]2 z2 :|"B" |: 
"Bb" [dB]2 [^cA][dB] |"F" [cA]2 [=B^G][cA] |"C7" [BG]2 [A^F][BG] |"F" [AF]2 [^GE][AF]"^I" | 
"Bb" [dB]2 [^cA][dB] |"F" [cA]2 [=B^G][cA] |1"C7" [BG]2 [A^F][BG] |"F" [AF]2 z2 :|2 
"C7" [eB]2 [dc][eB] |"F" [fA]2 z2 |]  