Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
Q:1/2=90
M:4/4
K:D
['f2 f2', 'e2 e2']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:D
 de | f2 f2 f2 ef | gedc defd | BdAd GdFd | cdef ecde | f2 f2 f2 ef | gedc d2 dc | Bbag fedc | 
 dcde d2 :: cd | e2 e2 eddc | cBA^G Acea | e2 e2 ed dc | cB A^G A2 de | fdcB gedc | aedc bgfe | 
 fefa A2 Bc | dcde d2 :|  