Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/16
Q:1/4=120
M:3/4
K:Amin
['g4 gagf e2e2 f2f2', 'B2A2 cBA^G']  
X:1
L:1/16
Q:1/4=120
M:3/4
K:Amin
"Am" efed cdcB A2c2 |"E7" BcBA ^GAGF E2FG |"Am"{B} A2^GA"E7"{c} B2AB"Am"{d} c2Bc | 
"Dm"{e} d2cd"E7" e4 [^GBe]4 :|"C" g4 gagf e2e2 |"G7" f2f2 f2ed"C" e2e2 | g4 gagf e2e2 | 
"G7" f2f2 f2ed"E7" e2ed |"Am" cBcd e2c2 B2A2 |"E7" cBA^G G4"Am" A2B2 |{d} cBcd e2c2 B2A2 | 
"E7" cBA^G G4"Am" A4 :|  