Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:3/4
K:G
['D [GB,]3/2', 'd G D [AC]', 'g d3/2 A/G/ B d x/ e']  
X:1
L:1/4
M:3/4
K:G
 D |:"G" [GB,]3/2 B/ d | d B"C" e |"G" d B g |"Bm" d B"B7" A |"Em" G3/2 B/ d |"G" d B"Em" G | 
"G" D B"D7" [AC] |1"G" [GB,]2"D7" [DC] :|2"G" [GB,]2 || d |"G" g3/2 f/ g |"C" e f g |"A7" e a g | 
"D" f"D/E" e"D7/F#" d |"G" g3/2 f/"G/B" g |"C" e"G/B" d"D7/A" c |"G" B"D/F#" A"A7/E" G | 
"D" d2"G7" B |"Am" c e"D7" c |"G" B d g | d3/2 B/"A7" A/G/ |"D" B A"D7" d | 
"G" g3/2"Em" x/ f/"C" e |"G" d B"Em" G |"G" D B"D7" [AC] |"G" [GB,]2 || B |"Am" c e"D7" c | 
"G" B d g | d3/2 B/"A7" A/G/ |"D" B A"D7" d |"G" g3/2"Em" x/ f/"C" e |"G" d B"Em" G | 
"G" D B"D7" [AC] |"G" [GB,]2 |]  