Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:3/8
K:F
['C FAF']  
X:1
L:1/8
M:3/8
K:F
 z2 C | FAF | GBG | E F/ z/ C | FAF | GBd | c2 C | FAF | GBG | E F/ z/ c | cdc | GBA | F2 z |]  