Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/2
K:Amix
['f ec d/c/B/A/ E2 EF G2 GA', 'd3 e']  
X:1
L:1/8
M:2/2
K:Amix
 f | ec d/c/B/A/ E2 EF | G2 GA B/A/B/c/ dB | ecTBA E2 Ef | efed Tc>BA :: c | d3 e fdde | 
 Tc3 e d/c/B/A/ GB | d3 e fddf | ecac A/A/A A :|  