Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:G
['G2 G ABc BAB', 'c d2 d dcB A2 A c2']  
X:1
L:1/8
M:6/8
K:G
S G2 G | ABc BAB | G2 D G2 G | ABc BAB | !fermata!G3 |]"^2.f. en rondeau" B2 c | d2 d dcB | 
 A2 A c2 c | B2 B ege | d2 dS |]  