Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
M:12/8
K:B
['D3 DGF ^E3 F3']  
X:1
L:1/8
M:12/8
K:B
"B" D3 DGF ^E3 F3 | B,3 B,A,B,"F#7" (D3 C3) |"B" D3 DGF ^E3 F3 |"G#m" F3"C#7" ^EDE"F#" F3 z3 | 
"E" E3 EEE"B" E3 D3 |"E" G3 GGG"B" F3 z3 | B3 BBB"E" B3 G3 |"B/F#" F3"F#7" FEC"B" B,3 z3 |]  