Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:Ador
['c2 E2', 'a2 ag efde']  
X:1
L:1/8
M:4/4
K:Ador
 c2 E2 cded | c2 E2 G2 G2 | c2 E2 cded | cABG A2 A2 | c2 E2 c2 E2 | c2 E2 G2 G2 | c2 E2 cded | 
 cABG A2 A2 || a2 ag efde | cdef g2 e | a2 ag efde | cA BG A2 A2 | a2 ag efde | cdef g2 z2 | 
 abga egde | cABG A2 A2 ||  