Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:G
['B>AGg e/f/g d>B', 'BGdG eGdG']  
X:1
L:1/8
M:4/4
K:G
 d | B>AGg e/f/g d>B | c>edB cAAc | B>AGg e/f/g d>B | c>edc BGG :| d | BGdG eGdG | c>edB cAAc | 
 BGdG eGdG | c>edc BGG :|  