Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/8=150
M:2/2
K:G
['e d>GB>G d>Gc>e d>GB>G AB/A/ c>e c>GB>G', 'd>gB>g g>dc>g B>gA>g g>de>g']  
X:1
L:1/8
Q:1/8=150
M:2/2
K:G
 e | d>GB>G d>Gc>e | d>GB>G AB/A/ c>e | c>GB>G Bc/d/ dg | e>cB>c BGG :: e/f/ | g>dB>g d>gB>g | 
 g>dc>g B>gA>g | g>de>g d>gB>g | e>cA>d BGG e/f/ | g>dc>g d>gB>g | g>dc>g B>gA>g | g>de>g d>gc>g | 
 B>gA>f BGG :|  