Compose a suitable series of chord progressions that complement the provided musical composition.
C/D/ E/F/ G E | F D E C | E/F/ G/A/ G E | F D C2 |: G G A2 | 
 F F G2 | E E"^An7" G F | E D C2 :|  
X:1
L:1/4
M:4/4
K:C
"C" C/D/ E/F/ G E |"G7" F D"C" E C |"C" E/F/ G/A/ G E |"G7" F D"C" C2 |:"C" G G"F" A2 | 
"G7" F F"C" G2 |"C" E E"^An7" G F |"G7" E D"C" C2 :|  