Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:4/4
K:C
['', '(cA)Ac (BG)GB', '(ec) gcec']  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:Amin] .abc ed"^segno" |: (cA)Ac (BG)GB | (cA)AB (cd)ed | (cA)Ac (BG)GB | 
 (3(cBA) BG (EA)AB :| !fermata!c2 (ec) gcec | G2 (BG) dGBG | c2 (ec) gcec | (ea)ag (ea)ab | 
 geeg (^f<d)d=f | e>cc(e d<B)GB | (AB)cd (ef)ed | (3(cBA) BG (EA)AB"^segno" |]  