G, 1 sharp
Once through the music is once through the dance. Dance is typically done 2-4 times in a row.
I think the music in Practise for Dauncing wants an extra repeat sign:
Consider it as three strains, A, B, C: the structure is AA BBC BBC.
The version we are starting with can be found here as part of Practise for Dauncinge
Advice for beginners:
Focus on the second or fourth line to begin.