Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=85
M:2/4
K:C
['cc/c/ BA G2 cc/c/', 'ed de/f/ ge/d/ c2 AB/c/ df ed']  
X:1
L:1/8
Q:1/4=85
M:2/4
K:C
 cc/c/ BA | G2 cc/c/ | df ed :| de/f/ ge/d/ | c2 AB/c/ | df ed | cd/c/ AG/F/ | G2 cc/c/ | AF G2 ||  