Watch the Day 2 online guitar lesson by Ravi from Learn Guitar in 21 Days
Given that there are not too many one chord songs, this won't be the most rewarding moment of the course! However, that's okay because good things come to those who wait, and I won't make you wait too much longer! Nevertheless, if you can sing a melody while strumming the A chord, you'll start to hear the musicality of what you have already learned.
Just like I did on Electric Avenue, you can hear that the song really is captured in the melody, and the chords provide the support for that melody with harmony and rhythm.
Don't be too ambitious here and don't be frustrated if it doesn't sound like much, but go ahead anyway and sing a melody while playing a simple down strum on the A chord, who knows, you might even discover that you already have a knack for writing songs!