Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/4
M:4/4
K:Eb
['A G F B, D', 'B,2 C3/2 D/ C C F3/2 E/', 'B2 B B E B/B/ A G']  
X:1
L:1/4
M:4/4
K:Eb
 B B E B/B/ | A G F B, | D E F F | G/ F3/2 B,2 | B B E B | A G F B, | D E/E/ F F | G/ F3/2 B,2 || 
 C3/2 D/ C C | F3/2 E/ D/C/ B, | F3/2 =E/ F G | =A c B2 || B B E B/B/ | A G F B, | D E F F | 
 G/ F3/2 B,2 |]  