Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/2
K:D
['d2 (fd) AAfd eefd B2 (AB) defd', 'a(da)f (fe)ef']  
X:1
L:1/8
M:2/2
K:D
 uA | d2 (fd) AAfd | eefd B2 (AB) | defd AAfd | (fe)dB A2 AB | d2 (fd) AAfd | eefd B2 (AB) | 
 defd AAfd | (fe)dB AAA || uf | a(da)f (fe)ef | a(da)f B2 Bf | a(da)f (fe)ef | (d>e)dB A2 Af | 
 a(da)f (fe)ef | a(da)f B2 Bf | a(da)f (fe)ef | (d>e)dB A2"_Fine." A"^D.C." |]  