Develop tunes following the predetermined chord changes.
'C', 'F', 'G7', 'C', 'G7', 'G7', 'C', 'F', 'G7', 'C', 'G7', 'C'  
X:1
L:1/4
M:32/44
K:C
|: [GE]/[cG]/[ec]/ |"C" [ge]3/2 [fd]/ [ec] | [ec] [fd] [ge] |"F" [af]2 |"G7" [dB]2 | 
 [fd]3/2 [ec]/ [dB] | [Bd] [ec] [fd] |"C" [ge]2 | [ec]2 | [cG]/[ec]/ [ec] [dB]/[cA]/ | 
"G7" [BG]2 [GF] |"G7" [dF]/[fA]/ [fA] [eG]/[dF]/ |"C" [cE]2 [eG] | [ec] [ge] |"F" [fd] [ac] | 
"G7" [dB] [fd]/[ec]/ [dB] |"C" [ec] [ge] | [cG] [ec] |"G7" [dB]/[ec]/ [fd] [BF] |"C" [cE] z/ :|  