The George Fox song will be sung in unison – there are no harmony parts except at the very end of each chorus and even these are optional – just sing the tune at your own pitch.
Truth’s a Seed is in 4 parts. If you are not a reader of music you might find this a bit more challenging but hopefully the guide tracks below will make the task fairly straightforward. Make sure that you sing a part which is comfortable for your voice. People with low voices are asked not to sing the tune an octave lower.
You might just wish to record one of the songs rather than both of them.
The music and lyrics sheets are here:
Here are the audio tracks: