Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:4/4
K:Amix
['ecAB cdec dBGA Bcdf ecAB cdef', 'A2 A^g a=gab agef']  
X:1
L:1/8
M:4/4
K:Amix
 ag | ecAB cdec | dBGA Bcdf | ecAB cdef | gedB A2 a/^g/f | ecAB cdec | dBGA Bcdf | ecAB cdef | 
 gedB A2 :| A^g | a=gab agef | gfga gede | a^gab a=gef | gedB A2 A^g | a=gab agef | gfec dBGB | 
 ABcd egfa | gedB A2 :|  