Challenge 1
Key: C
Tempo: 120 - 140
Structure: AABA
A chords: C G Am F ( I V vi IV )
B chords: Am F C G ( vi IV I V )
Challenge 2
Key: B
Tempo: 130
Structure: AABA
A Chords: B F# G#m D#m E F# (I V Vi III iV V)
B Chords: G#m - D#m - E - F# (Vi III iV V)
Challenge 3
Key: C
Tempo: 100
Structure: ABAB
A Chords: Am Dm G Am (vi ii III vi)
B Chords: Am F G Am (vi IV V vi)