Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
["d3 d3 a>bc' bag eaf", 'G2 z', 'B>AG G>Bd']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 d3 d3 | a>bc' bag | eaf g2 z || G2 z G2 z | G>BA G>ED | G>EE E>Ee | d>cB B>AG | G2 z G2 z | 
 G>BA GED | G>ce d<Bd | d>cB B>AG | z4 || G>Bd dBG | e>dB B>AG | G>Bd e>cB | G>AB/c/ B>AG | 
 G>Bd dB>G | e>dB A>GA | G>ce dB>d | e>dB B>AG |]  