Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:2/4
K:D
['ff/e/ fg ba f2 ag', 'cc/B/ cd fe c2 ed']  
X:1
L:1/8
M:2/4
K:D
 ff/e/ fg | ba f2 | ag e2 | gf d2 | ff/e/ fg | ba f2 | ag ec | e/g/f/e/ d z |] cc/B/ cd | fe c2 | 
 ed B2 | dc A2 | cc/B/ cd | fe c2 | ed B^G | A/E/c/B/ A z |]  