Here are some recordings of folk songs that you can use to learn (and sing just for fun!) and to figure out the Solfa and the rhythm.
Remember, to figure out the Solfa, you are listening for intervals.
To figure out the rhythm, you are listening for how many notes happen during one beat. The metronome is set to 60 bpm on each song (unless noted otherwise).
Ainsi Font, Font, Font
Baa, Baa, Black Sheep
Frère Jacques (Are You Sleeping, Brother John?) (Sheet music for this song is on the Frère Jacques page.)
Hot Cross Buns
Peas Porridge Hot
Sur le Pont d’Avignon