Play the note D on the upper manual with the second finger of your right hand.
This is a half note.
It lasts for two counts.
There are only two half notes in one bar of * time.
This song contains four bars of half notes, using C and D.
The big numbers 1 and 3 tell you to play the note. The small numbers 2 and 4 tell you to hold until the next note.
These songs use a mixture of half and quarter notes
Because of the * time signature, there must be a total of four beats in each bar.