In lesson 1 Madeline teaches basic information about the ukulele (tuning, parts of the instrument, etc) and the C chord on which she plays “Old McDonald Had A Farm”.
C (throughout song)
Old McDonald had a farm, E-I-E-I-O
And on his farm he had a cow, E-I-E-I-O
With a moo-moo here and a moo-moo there
Here a moo, there a moo, everywhere a moo-moo
Old McDonald had a farm, E-I-E-I-0
(add verses and animals, continue on C)