Lead melody: Need 8-bar melody repeated. Let's define in beats with note numbers. Use A minor. Melody bars 1-8 over chords Am F C G Am F C G? Actually 8 bars = two cycles of 4 chords. Let's define for bars 1-8:

Bar 1 (Am): E5 (0.5), A5 (0.5), C6 (1), B5 (0.5), A5 (0.5), G5 (1)

Bar 2 (F): F5 (0.5), A5 (0.5), C6 (1), A5 (1), F5 (1)

Bar 3 (C): E5 (0.5), G5 (0.5), C6 (1), B5 (1), G5 (1)

Bar 4 (G): D5 (0.5), G5 (0.5), B5 (1), A5 (1), G5 (1)

Bar 5 (Am): E5 (0.5), A5 (0.5), B5 (1), C6 (1), B5 (1)

Bar 6 (F): A5 (0.5), F5 (0.5), A5 (1), C6 (1), A5 (1)

Bar 7 (C): G5 (0.5), E5 (0.5), G5 (1), C6 (1), B5 (1)

Bar 8 (G): A5 (0.5), G5 (0.5), D5 (1), E5 (1), G5 (1)

Need ensure total beats per bar = 4. Let's check:

Bar1: 0.5+0.5+1+0.5+0.5+1 = 4. Good.

Bar2: 0.5+0.5+1+1+1 = 4.

Bar3: 0.5+0.5+1+1+1=4.

Bar4: 0.5+0.5+1+1+1=4.

Bar5: 0.5+0.5+1+1+1=4.

Bar6: 0.5+0.5+1+1+1=4.

Bar7: 0.5+0.5+1+1+1=4.

Bar8: 0.5+0.5+1+1+1=4. Good.

MIDI note numbers: C4=60, D4=62, E4=64, F4=65, G4=67, A4=69, B4=71, C5=72, D5=74, E5=76, F5=77, G5=79, A5=81, B5=83, C6=84. So:

E5=76, A5=81, C6=84, B5=83, G5=79, F5=77, D5=74, etc.