Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/8
M:4/4
K:G
['b2 bg a2 af gbge d2 g2', 'G2 GB d2 (3gag efge d2 g2']  
X:1
L:1/8
M:4/4
K:G
 g>a | b2 bg a2 af | gbge d2 g2 | fdAB cBce | dBGA B2 ga | b2 bg a2 af | gbge d2 g2 | fdAB cdef | 
 gagf g2 :: z2 | G2 GB d2 (3gag | efge d2 g2 | fdAB cBce | dBGA B2 BA | G2 GB d2 (3gag | 
 efge d2 g2 | fdAB cdef | gagf g2 :|  