Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['ea a2', 'eA A2']  
X:1
L:1/8
M:4/4
K:C
 Tea a ve e!p!ace | D |[M:4/4][K:D] G befe!p! abac[Q:1/8=180]"^A modal" .cd | ea a2 eg g2 | 
 ea a2 ABcd | ea a2 efge | afge d2 :| cd | eA A2 efgf | eA A2 BG G2 | A2 cd efge | afge d2 :|  