Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=80
M:3/4
K:Amin
['c4 B2']  
X:1
L:1/8
Q:1/4=80
M:3/4
K:Amin
 (AB) |{B} c4 B2 | A2 E2 (A>B) | c4 B2 | A4 (GA) | B4 A2 | G2 (DE)(GA) |{A} B3 (c BA) | G4 (A>B) | 
 c4 B2 | A2 E2 (A>B) | c4 B2 | A4 E2 | c2 cdeg |{g} a4 g2 | (ede)gaB | A4 |]  