By now, you've already gathered a handful of musical "experiences" reading notes for the top 2 strings; the high E and B strings.
Here's the final song example to help ingrain the top 2 guitar strings (in open position), using When the Saints Go Marching In this time.
As review, here are the notes, and how they map to the fretboard. They'll be all you'll need for this song.
From here, you know what to do! Use the video above, use the diagram above, whatever you need to work out the music below.
Next, you'll finally uncover some information about the next string — the 3rd string, which is the G string.