L’harmonie des anges (Angel’s voices), composer Burgmüller, J., from 25 easy and progressive studies No 21
This lesson would be beneficial if you feel that you need to go through separate hands first before putting both hands together or just double check that you LH and RH are correct.
If you feel that both hands are fine in bars 1-9 then simply skip this lesson and go to the Lesson 5.